When fighting gets bad

Whenever my boyfriend and I fight he always takes things way out of hand and then when I get upset or depressed because he becomes very hurtful trying to prove he's right, I ask for him to leave, for him to leave me alone or to go somewhere else be cause I don't want to be around him or anyone really and he always refuses like he's trying to look tough and insist our room is his room and tells me if I'm not happy that I can't leave. Anyone understand this behavior? Know how to handle it or any advice!