Rob Kardashian went nuts last week, posting personal and graphic images of his baby mama Blac Chyna after Chyna sent Rob a video of her kissing another man.

[Related: Rob Kardashian posts graphic photos of Blac Chyna.]

In a new interview with ABC's Nightline, Chyna spoke on why she sent out the video that provoked Rob so.

"If somebody keeps poking at you, and poking at you, and poking at you, and keep poking at you, you're eventually going to pop," she explained. And so, I was just like, maybe if I send this video to him, then he'll just leave me alone."

"My and Rob have been broken up since December," she said in no uncertian terms.