<human>: Pretty much what the title asks. I'm not talking about a horrible relationship, or cheating, or lying, because I did none of that. I was literally nice as fuck when we broke up, and I was treated like shit in turn. He pointed out every single one of my flaws, blamed the entire demise of the relationship on me, and now, whenever we talk tries to rub his new relationship in my face and how much happier he is. It hurts, but not as much as I'd thought, because he's being so stupid. I wasn't the perfect girlfriend, I made mistakes often, I'll say that, but I don't deserve this. He just made the breakup way worse than it needed to be, and I tried to leave it on good terms but he just wasn't willing. He just really wanted to point out everything I had done wrong, I just don't know why. Any views or opinions? Has this happened to you? My first relationship/breakup and his too.

Provide a brief overview of the text.
<bot>: What causes some dumpers to just lose their shit when you haven't really done anything to warrant it, after a breakup?