Rob Kardashian blew up Twitter in early December when he publicly accused his then girlfriend, Rita Ora, of cheating on him with 20 other men. And according to Us Magazine, Kardashian broke up with Ora because he found out that she had slept with actor Jonah Hill while the two were still dating.

The magazine reported that Ora, 22, and Hill, 29, spent the night together in NYC in November after immediately hitting it off at a club. "Rita spent the night with Jonah during a trip to New York," a source told the magazine.

"She cheated on me with nearly 20 dudes while we were together, I wonder how many she will sleep with now that we apart? But I mean 20?!!!," Kardashian tweeted, earlier this month. "How can a woman who is so busy trying to start her own career have time to be with so many dudes all while in a relationship?!"

Kardashian also claimed he was "disgusted a woman could give up her body to more than 20 dudes in less than a year’s time while trying to start a career." Although Kardashian later backpedaled on the issue, saying that he had ever mentioned Ora by name in the angry tweets, those familiar with the Kardashians knew that he and Ora had been dating. Kardashian's tirade quickly led Twitter users to begin tweeting the hashtag #RitaWhora.

However, Ora painted a different picture of her relationship with the "Keeping Up With the Kardashians" star in an interview with Glamour U.K.

“I’m not going out with Rob," she told the British publication. "We were close for a while, but it didn’t work because I was never there. I was like a ghost. I used to get so frustrated with myself and then wonder why I was angry, so I decided it was best to keep it friendly, especially at the moment, when there’s so much going on.”

Hill recently split from girlfriend Ali Hoffman, the daughter of actor Dustin Hoffman. He previously ended a three-year relationship with his high school sweetheart, Jordan Klein, in October of 2011.