"She cheated on me with nearly 20 dudes while we were together, I wonder how many she will sleep with now that we apart? (sic) But I mean 20?!!!" Rob Kardashian wrote about Rita in December following their break up.
"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. I just had to do that to make her hate me," Rob explained on the show.
Khloe Kardashian added, "Rob was never allowed to admit that they were actually an item because she's in the entertainment industry. She wanted to represent herself as a single girl."
Kourtney said that the online posts could turn public opinion against him: "She's the one who's in the wrong but she'll probably try to make it like you're in the wrong for posting it."
Kim offered her two cents, "There's just no point [in tweeting]. You loved her for a reason. You aren't together for a reason now. You just always have to take the high road."
The derogatory tweets were removed once the media reported on the public spat.