He is dating my best friend now and since then, we've been arguing, discussing and offending each other all the time. It's making me insane. Everbody tell me that he is the one who are wrong, when we discuss the situations between us and I tell them about us fighting. I really try to tell it from both sides and the conclusion is allways that he is the one beeing unfair.
But I don't know. Of course it's also me. But I don't think it's my fault. I hate conflicts and try to avoid them, but it's not that if something is important to discuss I neglect it. In other words I feel balanced and hate fighting just for fighting. But when we are fighting it's ALLWAYS only about:

That somethings wrong with me(I'm too fat according too him, to lazy, too boring, don't do stuff the right way and so on)

That my religion is wrong

That my habbits are wrong

That I've done wrong stuff(I can't do nothing about) some years ago and how bad it is(taking LSD for example)

That I'm not able to cook(I am good at it)

It drives me sick that he can't accept me for the person i am. And that he's low selfasteme makes him offending me.
He is also making fun of me in front of our mutual friends.
He hit me and we are fighting, people says it's unfair because he's so big and strong. But he just say "she is so fat anyway our weight's the same"(I'm not fat, 68)
I feel like I have to do everything right in he's company and I can't relax. I can't even say a wrong word without him attacking me, telling me my kids' going to have a fucked up language. And I'm very good in school and his can't spell...

What do you think, what's wrong with him, is something wrong with me or what? I really wish that this could stop. Me relationship to my best friend haven't changed.

-A broken sister