Rita Ora dissed her ex, Calvin Harris, in her latest interview for Marie Claire as she claimed that Taylor Swift's boyfriend threw her under the bus at a time when she needed him the most.

"There was a reason why I split up with him," she told the magazine. "And there was a reason why I'm at this point in my life where I feel like I have so much musical freedom, and I don't have to explain myself to anybody... It was more of a thing where I was in awe."

"I was at that point in my relationship where I felt he could do no wrong. I thought he had my back and that he'd never steer me wrong," she added. "But then 'I Will Never Let You Down' came out, and everything started to go a bit weird. I don't know if it was because business was mixed with personal or what."

According to E! News, Rita Ora was supposed to perform "I Will Never Let You Down" at the Teen Choice Awards in August 2014 but had to cancel at the last minute because Calvin Harris refused to allow her to sing the song he wrote and produced.

In his Twitter, he wrote, "You'll only know 1 side of the story RE Teen choice awards because I choose not to talk to the papers about every aspect of my personal life. But just know I had a damn good reason."

"Calvin Harris has been on his best behavior since he began dating Taylor Swift, but is it all an act - will his true colors start shining through?" Celebrity Dirty Laundry said.

But OK! magazine ran an article which claimed that Calvin Harris reportedly cheated on Taylor Swift with beautiful brunette while performing in Las Vegas.

It came as no surprise, however, as Calvin Harris was reportedly dating Aarika Wolf when he got on Taylor Swift.

"We're told the EDM superstar confessed to a pal that he was cheating on model Aarika Wolf with the singer before ending their six-month relationship and moving on to Swift," said the article. "As far as we know, TayTay didn't know that Harris was otherwise attached when they first got it on."