Is this domestic violence?

I'm 17 and my boyfriend is 18. We are still in school and live in different houses with our parents. We've been together 3 and a half years. 
He's started being really violent lately, hitting me and pushing me. I've had bruises. 
My question is, is this domestic violence even though we don't live together? If not, what do you call it? I'm preparing to break it off but need to explain it properly.