Rob Kardashian Hits Back At Rita Ora's Calvin Harris Comments With Subliminal Tweet?

Rob Kardashian has prompted speculation that he may not be completely over his failed romance with Rita Ora after posting a cryptic message on Twitter this week hinting at heartbreak, coincidentally just as his pretty ex gushed about her newfound love with DJ Calvin Harris.

The Keeping Up With The Kardashians star, who endured a bitter split from the 'I Will Never Let You Down' singer in 2012, made a dramatic return to Twitter earlier this week and posted a mysterious message which some have attributed to his weight loss struggles.

“No one will ever understand how much it hurts,” Rob tweeted yesterday.

The tweet came just hours after extracts from Rita's interview with Elle magazine had been released, and features the British star cooing over her relationship with producer Calvin, whom she has been dating for around a year.

In the magazine interview, Rita candidly said: “There are so many things. The fact that he got something out of me that I never thought I had. Yes, like falling in love. I just didn’t think I had it. I’d never experienced it before.

“And I was just like in the wilderness, thinking, 'Will it ever happen?'”

Rita, 23, and Rob, 27, had a very public break-up in December 2012 but it wasn't the most amicable affair with the reality star appearing to accuse the Roc Nation songstress of cheating on him during their relationship.

Several months after the scandal, Rita spoke out on their split saying that she didn't actually believe they were in a genuine relationship.

“I never thought it was actually a relationship, in all honesty,” Rita told Australian newspaper The Sunday Telegraph's Sunday Style magazine in March 2013.

“I never mentally defined it as 'boyfriend, girlfriend'. When I split up with him, I said, 'It's because I'm never there, I don't know how to do it.' That's all I said, then... the rest happened. He obviously felt that creating myths was the way forward.”