Rob Kardashian's brutal breakup with Rita Ora played out on Twitter ... and last night's episode of "Kourtney & Kim Take Miami."

Back in December, the only Kardashian boy went off on one of his exes on Twitter, alleging she cheated on him with "nearly 20 dudes" during their year-long relationship.

At the time Rob was careful not to mention Rita by name -- a trend that continued on the E! reality show. Instead, a blurred-out image of Rob with a blonde was shown ... a blonde who looked just like Ora.

"Rob was never allowed to admit that they were actually an item because she's in the entertainment industry," Khloe said of his relationship last night. "She wanted to represent herself as a single girl."

While his sisters urged him to step away from the cell phone and stop trashing his ex online, Rob adamantly defended his actions.

"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," he added.

His only worry: "I don't want people to think I'm being a b***h."

Sorry Rob, but looking at the Comments section from our post back in December, that's exactly what everybody thinks.

How do you think he handled the entire situation? Sound off below.

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