What to do about the fighting?

My boyfriend and I are fighting alot lately and I don't know how to get past it. He says that when Im sarcastic Im being mean. I cant help that Im sarcastic and I dont mean for it to see like Im trying to be mean. He still talks to his exs and im not that Im worried about him cheating. I think its just a territory kind of thing. He wants to spend 24/7 with me and I think that may be the problem. All this little bickering is tearing me apart, he says Im jealous and dont trust him, and I say he doesnt let me be myself....HELP!