Even If I Told you... Would You Even Understand?

I'm so done with my ex.

My ex was literally trying to guilt trip me into feeling bad about leaving him but the more I think about it, the more I've realized that he wasn't the best boyfriend when we were together because every time his friends or brothers were jerks to me, he wouldn't do anything about it and sometimes he would make fun of me or the way that I say things which really made me mad and he also would grab my thigh without my permission which made me super uncomfortable but he obviously didn't care... And I really want to block him but I don't want to seem like a jerk what do I do??