When we were living at my parent's house, he was better at controlling his anger because my parents were around. It has been unleashed more now that we moved out.
Quite. He is no longer under the threat of being kicked out of your parents' house because of the way he treats their daughter right under their own roof. He wasn't going to be able to hit you there and get away with it.
I haven't heard you say you love him, and for sure he doesn't sound lovable in the least. I have seen you say you think he can't make it on his own or get better without you.
So unpacking that idea - how exactly is your staying so he can beat and/or strangle you going to help him get over his anger problem?