A member of the Kardashian clan is experiencing some serious romance issues, but it's not one of the usual suspects. After a few months as an item, British pop star Rita Ora and reality star Rob Kardashian called it quits. Kardashian went public with the break up via Twitter earlier today calling Ora a serial cheater. 

"She cheated on me with nearly 20 dudes while we were together,” Kardashian posted on Twitter. “I wonder how many she will sleep with now that we apart? But I mean 20?!!!.”

The couple had been quietly dating for months, but things ended with a bang as Kardashian continued his Twitter rant.

"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?!," he wrote. "When a woman cheats on you with one man I can live with that. People make mistakes, trust me. I have forgiven numerous times…But when a woman disrespects herself by messing with more than 20 men all while being in a relationship with a Faithful man...I just don't get how a woman can do that to her body. And your career hasn't even launched yet. I don't put up with sloppiness. LOYALTY"

Khole Kardashian-Odom came to her younger brother’s defense tweeting, "Cheaters never prosper @RobKardashian ill be home today… Try and smile little brother.”

Rob Kardashian removed all pictures and tweets of the "R.I.P." singer, and "Rita Whora" started trending soon after his online outburst.

Distance and a demanding work schedule were to blame for the split according to an unnamed source that spoke to The Sun. The 22-year-old singer lives in London while Kardashian lives in Los Angeles. Ora has not yet responded to the attacks.

However, it appears Ora had been having doubts about their romance for some time. She told Glamour magazine in a recent interview, "In 22 years, there’s been nothing. I’ve had young fascinations but never love."

"I think it’s my only weakness. I’m scared of letting my guard down, and if I fell in love with someone now, he’d have to try 10 times harder to break it down," she told the mag.

Ora refered to Kardashian as a “friend” when asked about him later in the interview.

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(Photos from left: Mike Marsland/WireImage, Paul Zimmerman/Getty Images for Macy's)