If he had touched me like in your last fight, I would call the cops and his parents after I threw his stuff outside. I know you do not want to involve anyone else, but if you don't, it will get a lot worse for you. His parents probably have no idea what's going on but are probably so glad to have him gone that they would send him money so he won't be back. This guy has no respect for anyone. He thinks he's got a sweet deal. His own place to himself he doesn't have to pay for. Does not have to work. And as a bonus, someone he can verbally, emotionally and lately phsically abuse! Man, it doesn't get any better than this...oh wait...mom's getting involved...it's getting even better. Just get him out and lock the door behind him.