I dislike my friend's boyfriend.
What is it that makes you dislike him?
I find him psycho, pretentious and conceited.
It sounds like you guys have had your differences in the past. You should at least tolerate him though if your friend is important to you. I think that it is expected.
I never thought about it like that. I guess it would be nice to do that for her.
You're right, it would be nice. You may just have to tolerate this guy even though you don't like him so that you don't cause tension in your relationship with your friend.