The R.I.P. hitmaker was first linked to Kim Kardashian's younger brother earlier this year (12), but it emerged on Monday (03Dec12) that their long-distance relationship had crumbled, reportedly as a result of their busy schedules.
Rob has since shed a little light on the real reason behind the split in a series of furious Twitter posts, in which he hits out at a cheating ex - although he stopped short of naming Ora outright.
The scorned Tv personality tweeted, "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?!!! 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?!
"I'm actually 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."
The tweets have since been deleted, but not before his sister Khloe weighed in on the controversy, writing, "Cheaters never prosper @RobKardashian ill (I'll) be home today... Try and smile little brother." She also encouraged Rob to "be nice".