Because she's an idiot. He's an ex and it sounds like you are well rid of him at last. Perhaps this is why you didn't mourn the end of the relationship like you had in others in your past. It sounds like he's a psycho idiot. No offense.
Why is she playin victim? My ex cheated, cyber stalked me, black mailed me with photo shipped porn and threatened to kill me! The girl he cheated on me with is playing victim as if he did that to her.