Rob Kardashian, Rita Ora Break Up? Reality Star Accuses Girlfriend Of Cheating With 20 Men (VIDEO)

Reality star sibling Rob Kardashian is a single man after breaking up with a woman -- rumored to be singer Rita Ora -- who he claims cheated on him with 20 different men.

"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 on Monday, according to The Insider. "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?!"

Karadshian never names Ora in the angry break-up tweets, but the two have reportedly been dating for a few months now.

GossipCop has a screenshot of one of Kardashian's tweets . The website reports sister Khloe Kardashian Odom attempted to comfort her brother, tweeting, "Cheaters never prosper @RobKardashian ill be home today Try and smile little brother. That tweet, along with Rob's entire cache, has since been deleted.

On Monday, "Rita Whora" began trending a bit after Kardashian's outburst, seemingly referring to Ora, E! News reported.

Theyd only decided to go public with the romance a couple of months ago so as not to put any pressure on themselves but theyve already split," a source told The Sun about Kardashian and Ora's break up. "Rob has now deleted everything on Twitter that reminds him of Rita.

He was reportedly set to join the singer for her birthday bash at Londons DSTRKT nightclub on Nov. 26, but the two split before the big night, according to The Sun.

Reports of a relationship first spread over the summer, and in October, Kardashian and Ora shared intimate photos on Twitter, hinting at a budding romance. But, in a recent interview with Glamour U.K., Ora denied they were dating , according to MTV News.