Rita Ora is finally opening up about Rob Kardashian and his claims that she cheated on him during their relationship.

“You should have to sit an exam before you go on Twitter,” she told the (UK) Sun. “To see if you’re mentally stable.”

In December, Kardashian went on a Twitter rant about Ora, writing “She cheated on me with nearly 20 dudes while we were together, I wonder how many she will sleep with now that we apart [sic]? But I mean 20?!!!”

He also wrote that he was disgusted that a woman could "give up her body" to 20 men in one year. His sister, Khloe Kardashian, tried to calm Rob down, tweeting, "Rob be nice kiddddd." He has since deleted all of the tweets.

But Ora reveals that she never even thought of Kardashian as her boyfriend.

“I never actually thought it was a relationship in all honesty. 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.”

On a recent episode of “Kourtney & Kim Take Miami,” Kardashian admitted that he may have exaggerated the truth about Ora cheating out of anger.

"I posted what I posted to keep myself from taking her back. Every time she messed up, I took her back for over a year now," he said. "I just had to do that to make her hate me."

Us Weekly reported that Kardashian was so distraught during his relationship with Ora that he gained 40 pounds.

He has since been training with rapper The Game to get back into shape, and uses his Twitter account to share fitness information and details about his new diet regimen.