Rob Kardashian has admitted he is in a lot of pain.
The 'Keeping Up with the Kardashians' star, who gained 50 pounds following his ugly split from Rita Ora in 2012, posted a cryptic message on Twitter, amid reports he is increasingly unhappy about his weight and battling depression.
The 27-year-old reality TV star tweeted: "No one will ever understand how much it hurts."
His troubling post came just hours after his ex-girlfriend hit the headlines for telling the UK's Elle magazine that she had never "experienced" love before her current boyfriend Calvin Harris.
Rob, who failed to join his family on their holiday to Phuket, Thailand, has made no secret of his desire to get back in shape over the past year.
A source previously told UsMagazine.com: "(He is) really depressed. The family is very concerned about him."
The insider also claimed that despite being open about his desire to lose weight and having a personal trainer on speed-dial, Rob "rarely shows up" to his training sessions.
Another friend recently claimed that Rob doesn't want to attend his older sister Kim Kardashian's wedding to Kanye West in Paris in May because he's so unhappy with his appearance.
The source said: "Rob is upset about his changing shape and truly feels like the black sheep of the family. Kim is his sister. He loves her. But he knows this will be all about Kim and as usual, Rob feels he would be like the third wheel.
"The reality of their situation is that Kim and Rob haven't been that close in years. Deep down, she thinks he is a total slacker and it's very hurtful to Rob."

Lupita Nyong'o screeched "with glee" when she heard Jay Z mention her in a new song.
The '12 Years a Slave' star is thrilled to have received a "shout-out" from the 44-year-old rapper - real name Shawn Carter - in his freestyle collaboration with New Orleans emcee Jay Electronica, 'We Made It.'
The Oscar-winning actress wrote on Twitter on Wednesday (02.04.14): "Dear Mr. Carter & Mr. Thedford, your shout-out made me screech with glee. Mad BK & NOLA love. #WeMadelt - LN @S_C_ @JayElectronica (sic)"
Jay Z rapped about Lupita's success at the Oscars last month on the track, which includes the lyrics: "I'm on my Lupita Nyong'o, Stuntin' on stage, after '12 Years A Slave.' This Ace of Spades look like an Oscar. Black tux, look like a mobster."
It was recently revealed that the 31-year-old Kenya-born beauty is dating 'Wavin' Flag' hitmaker K'Naan, 36.
The couple got together in September after bonding over similar interests and live in New York City.
The insider recently told UsMagazine.com: "She loves his humanitarianism. They're both passionate about African issues."
The Somali-born rapper has two sons with his ex-wife Deqa Warsame and is taking his new romance Lupita slowly.
The source added: "She hasn't met his kids."

Daniel Radcliffe enjoys partying with his co-stars after coming off stage.
The former 'Harry Potter' star, who will bring Martin McDonagh's dark comedy 'The Cripple of Inishmaan' to Broadway in New York City later this month, following a successful run in London, admits he likes to let his hair down after performing in front of an audience.
The 24-year-old actor, who became teetotal in 2010 after his drinking spiralled out of control told the April issue of DuJour magazine: "I love to hang out after shows. On 'How to Succeed,' we had something called Thursday Night on Broadway, because Thursday we'd have an early show, and after we'd all have a party upstairs in one of the dressing rooms. That's the sort of stuff that makes a show, and this company of 'Cripple,' we're really a close-knit group, we make each other laugh quite a lot so I'm sure I'll be repeating some of those nights."
Daniel is very comfortable in the theatre and doesn't get upset if he messes up a scene.
He explained: "Broadway is an amazing environment to work in as an actor. People talk about it all the time, but it's a new experience every time, and the community aspect of it is brilliant and amazing and unexpected to me.
"I don't remember something ever going so wrong on the stage that it ruins a show. Even if you do s***w up, that's one of the exhilarating things about being on stage--people jump in and help out, and you always get through it."
But the British star insists that films are still his first love and he will never turn his back on Hollywood.
He said: "It was what I grew up in. I feel like if I had to do one thing forever, that would be it."

Kate Winslet is still "haunted" by her nude scene in 'Titanic.'
The Oscar-winning actress, who stripped down for an intimate moment in the 1997 blockbuster, during which her co-star and good pal Leonardo DiCaprio's character, Jack Dawson, draws a picture of her character Rose DeWitt Bukater's naked body, admits she finds some parts of the movie "very uncomfortable" to watch and refuses to sign photographs or recreations of the original drawing.
The 38-year-old beauty told Yahoo! Movies: "I don't sign that [picture]. It feels very uncomfortable. Why would you do that? People ask me to sign that [picture] a lot.
"There's a photo of it as well that someone has lifted from a still of the film, and that photo gets passed around too. I'm like 'No! I didn't mean for it to be a photograph that I would end up seeing still 17 years later."
The actress, who has a four-month-old son, Bear, with her husband Ned Rocknroll and children Mia, 13, and Joe, 10, from previous relationships, added: "It's still haunting me. It's quite funny really."
The 'Divergent' star recently admitted she often "vomits" before shooting challenging scenes.
She said: "I think you get really good at mind-f***ing yourself, to be honest. Acting is bloody scary. I still have moments when I think, 'I can't do this - everybody thinks I'm absolutely sh*t.' There are scenes I absolutely dread - there was a scene in 'Labor Day'; the whole courtroom sequence in 'The Reader'. I often throw up, which I'm a bit embarrassed about. It's the adrenaline."

Beyoncé Knowles is being sued by two of her fans.
Raquel Castellanos and Gabriella Davidson, who were trampled before one of the star's concerts in Chicago late last year, have filed a lawsuit against the 'Drunk in Love' hitmaker in Cook County Circuit Court.
According to court documents, obtained by CBS' local affiliate in Chicago, the duo said they bought general admission tickets and arrived a few hours early at the United Centre in the city for the 32-year-old singer's gig in December because they wanted to get as close to the stage as possible.
The suit states: "As the hours passed, the group became larger, more dense and more anxious about how, when and where the gate(s) would be released and where ticket holders and fans were supposed to enter The United Centre -- none of which was explained."
When the doors to the venue eventually opened there was a stampede and they got knocked to the ground and trampled by a "rushing mob," leaving them both unconscious.
They also suffered broken bones and other injuries during the incident, and missed the show because they had to go to a local hospital.
The "long-time fans of Beyoncé" believe that the arena, concert promoters and Beyoncé are responsible for the chaos and did nothing to prevent the incident from occurring.
The women are seeking an undisclosed amount in damages in the six-count suit that alleges negligence on the part of The United Centre, Live Nation and the singer.

Kim Kardashian wants to lose five more pounds before her wedding.
The 'Keeping Up with the Kardashians' star has lost 50lbs. since giving birth to her first child, North West, last June but is following the high-protein Atkins diet again, as she wants to wow her fiancé, Kanye West, with her slim figure when she walks down the aisle in Paris next month.
A source told Us Weekly magazine: "[Kim] is still losing more every week. She wants to look the best she possible can for her wedding photos."
The brunette beauty, 33, has upped her workouts to five times a week and banned carbohydrates, including bread and pasta, from her house.
The insider explained: "She'll eat veggies, but no noodles, rice or bread. It shocks her body. It's the only way to get the weight off. She does 100 squats each morning to lift her booty."
The reality TV star, who is set to tie the knot on May 24, recently admitted she had gained some weight after relaxing her diet.
She previously said: "I actually saw I gained some weight back when I saw pics of myself and started it again. I had to check myself. I work out five times a week & try to eat as healthy as possible."
Kim and her family have been renting a $150,000 beachfront villa in Phuket, Thailand for the past week and donated "loads of toys" to a local orphanage during a surprise visit.

Peter Jackson has lent his private jet to the search for missing Malaysia Airlines Flight 370.
The 'The Hobbit: The Desolation of Smaug' director's $80 million G650 is being used to search for the airliner, which vanished en route from Kuala Lumpur to Beijing on March 8, off the coast of Australia.
A spokesperson for the filmmaker told the New Zealand Herald newspaper: "A lot of civilian and military aircraft are involved in the search and it's kind of disappointing that because one is owned by a celebrity it becomes a matter of news when there are [over] 200 people missing.''
He also denied that Peter, who is worth an estimated $400 million, decided to loan his jet for attention, saying: "Peter would not seek publicity for something like this and would actively avoid it in fact."
The 'Lord of the Rings' director purchased his jet in March 2013 for approximately $80 million and it registered to his production company Wingnut, according to The Hollywood Reporter.
His spokesperson also confirmed the jet is available for charter via the service Execujet and is currently on charter in Perth, Australia.
It was recently reported that Peter had sold two of his penthouses in New York City to Taylor Swift for $20 million.

Sandra Bullock's ex-husband is being sued by his former divorce lawyers.
Jesse James, whose split from the 'Gravity' actress was finalised in 2010 after he cheated on her with multiple women, reportedly owes the attorneys that represented him $100,000 in unpaid bills but they are seeking more than $500,000 in damages.
California law firm Yanny & Smith filed a lawsuit against the 44-year-old TV personality, claiming he agreed to pay them a "fixed monthly retainer" in March 2009, shortly after his affair with Michelle McGee was exposed.
The lawyers "provided legal services to" Jesse, who owns custom motorcycle business West Coast Choppers in Texas, until July 23, 2012, including "overseeing the resolution of dissolution of" his marriage to the Oscar-winning actress.
According to court documents, obtained by gossip website RadarOnline.com, they also successfully defended Jesse "through trial and post-trial motions in a suit concerning an alleged joint venture involving a proposed clothing line to be sold at Wal-Mart where 12 to 14 million dollars of compensatory damages were being demanded of James."
They also allegedly defended Jesse when he was sued by a paparazzo and provided "representation in other adversarial proceedings including allegations of sexual harassment, disputes regarding defendant's failure to pay monies due to other people, etc."
The lawyers claim that while "invoices were generated periodically and sent to defendant," they were never paid and are seeking $500,000 to cover the bills, interest and damages.

Emma Watson finds it hard to commit to living in one place.
The 'Noah' actress has a home in London and also a property in America while she's studying at Brown University in Rhode Island and says she can't decide where to settle down while she continues to live a jet-setting lifestyle.
Speaking in the May edition of Australia's ELLE magazine, she said: "People are like, "Where are you living? What are you doing?" I don't know.
"I'm too young to decide right now if I want to live here or in New York or in LA or wherever else. And I really struggled for the answers the past three years. I should really know! I should really commit!"
The 23-year-old star, who is currently dating Oxford University student Matthew Janney, also insists she doesn't want a "famous" boyfriend but wishes she could protect her new love from the public eye and wants to feel "safe" at home.
She added: "I was like, 'I need to find a way to always feel safe and at home within myself.' Because I can never rely on a physical place."
Meanwhile, Emma feels as though she's grown up in the spotlight and admits it hasn't always been easy.
She said: "Everyone has seen me with my terrible haircuts and my awful teeth and all the terrible things I wore and said."

Kendra Wilkinson believes Miley Cyrus sets a "good example" to young girls.
The former Playboy model - who will give birth to her and husband Hank Baskett's second child, a girl, next month - thinks the 'We Can't Stop' singer is a little "crazy" but insists the singer is just being herself and these are values she hopes to instill in her daughter.
Kendra told E! News: "She's a very good example. As much as we think she's crazy, I think she's a good example. Let's not be so trapped in a box. I'm going to teach my daughter that way - be who you want to be. Society's going to put these rules on you but if you have this feeling that you need to do whatever it is, do it."
Miley has openly spoken about her use of party drug ecstasy, and love of marijuana but Kendra - who also has a four-year-old son, Hank Jr., with her spouse - clarified she would never push her unborn daughter to experiment with anything illegal.
She added: "Now, I'm not saying drugs. I'm not saying that I'm pushing her or inviting her to a bad world. What I'm saying is we're all human. We're all going to go through those stages at one point of our lives. Is it going to be later or is it going to be earlier? Eventually, they will go through it."

Jennifer Lopez is "so proud" of Matthew McConaughey.
The 44-year-old beauty starred with the 'Dallas Buyers Club' actor in 'The Wedding Planner ' in 2001 and thinks he is very deserving of his recent spate of award wins.
She said:"It was great working with Matthew. So proud of what he's accomplished over the last few years and I have fond memories of him on set."
Despite her many career accomplishments, the 'American Idol' star - who has six-year-old twins Max and Emme with former husband Marc Anthony - is more proud of her 2012 'Dance Again' world tour than anything else.
In an extract from Para Todos magazine's April 2014 issue obtained by JustJared.com, she said: "There are so many wonderful things that I've experienced in my career, but I think going on my first world tour is something I am most proud of accomplishing. Performing live and connecting with the audience night after night was incredible. I felt like I grew as a person and as a performer."
The 'On the Floor' hitmaker has been working on her next album since the tour concluded last year and she is delighted with all the collaborators she has recorded with.
She said: "I started working on this album the second I got off tour. What makes it so unique are all the collaborations including French Montana, Robin Thicke, Wiz Khalifa, Maxwell, and of course Pitbull. This is a special album, because I'm going back to my early roots of growing up in the Bronx."

Gwyneth Paltrow and Chris Martin were "off and on for many years" before separating.
The former couple - who have children Apple, nine, and Moses, seven, together - announced last week they were splitting after 10 years of marriage, and insiders admit they weren't surprised by the announcement.
One source said: "They were physically separated and emotionally."
Another source added to People magazine: "They have been on and off for many years. The marriage was falling apart."
The 'Iron Man 3' star and her Coldplay rocker spouse had successfully managed to juggle their busy careers and family life but friends say it was impossible for them to keep maintaining a balance.
A source said: "They seemed to have a pretty mature handle on that crazy rotation of being superstars and parents. But that balance, given the time they had to spend apart, clearly couldn't sustain itself."
And another friend thinks Gwyneth and Chris' different personalities also played a part in the problems with their marriage.
The insider explained: "[Chris] is the kind of person who is always in a T-shirt. She's much more glam."
Despite their split, the pair have vowed to stay friends for the sake of their children and are currently enjoying a family vacation.