Did Rita Ora’s Song ‘I Will Never Let You Down’ Cause Her Breakup With Calvin Harris?

'I thought he had my back,’ Rita said.

They say don't mix business with pleasure, and it looks like Rita Ora figured that out the hard way.

The "Poison" singer dated producer Calvin Harris from May 2013 until early 2014, but is now giving fans a glimpse into what went wrong.

"There was a reason why I split up with him. 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," Rita told Marie Claire. "I was at that point in my relationship where I felt he could do no wrong."

Calvin, who is now dating Taylor Swift, wrote and produced Rita's single, "I Will Never Let You Down," which seemed to be the beginning of the end of their romance.

"I thought he had my back and that he'd never steer me wrong," she said. "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."

What started as an amicable split, with Calvin tweeting nothing but nice things about the singer, turned into something a little more complicated.

Two months after the split, Calvin would not allow Rita to perform their song at the 2014 Teen Choice Awards, forcing her to pull out of a scheduled appearance.

"[Harris] has to approve anything TV-wise, for anybody that doesn’t get it," she said. "So he has to approve the rights to [use the song] and he didn’t approve the Teen Choice Awards.”

Calvin then fired back on Twitter saying he had a "damn good reason" to not have her perform.

“Imagine there is a relentless volume of stuff written about you and it’s nonsense and lies. And then you get so many lies stacking up against you, there’s a point where you’re just like ‘oh man, I’ve got to say something’” Calvin said of the tweet last November. “Because it was just like, oh come on, stop it! So I did that – it didn’t do any good, probably shouldn’t have really done it but then it continues. So I don’t care. I cared for a minute because it was every day, it was like ‘stop talking about me’."