Why do men say such mean things when ending a relationship?

I know women do this as well but men are just completely evil. My ex and I recently ended our relationship and he called me a million and one names, literally, and honestly the fight was about him still having feelings for his ex, and me constantly accusing him that he does, then the first thing he does is tells me how great she is and how I’ll never be like her, mind you the break up escalated from an argument because I always accuse him of still having feelings for her because he cheated on me with her last year, and saw her a few times during my pregnancy, it’s not my fault I have issues with this, he should consider himself lucky I even stayed with him after all this, right? lol ):