How can i help my friend?

My friend gets really cut at the smallest things. and he says all this stuff to hurt me and whenever i reply to stick up for myself or to retaliate he gets even more cut it just keeps going round in circles.. for instance, we would be going out, and hed be all like i dont want to and keep making excuses. and then i;d be like, "come on dont be tight" then he said "stop telling me what to do" and get real cut.. how do i tell him that hes too sensitive without getting into it again? I'm just trying to help him.