I don't know what the actual "laws" are about this, but I was living in an apt. with my kids' dad, and he whooped my butt on quite a few occasions. I repeatedly told him to leave - not on lease, not paying rent, nothing - and he wouldn't go, claiming that because his mail came here, he lived here, too bad for me. I finally just called the police to come when it got real ugly one night (actually I called my mom who called the police for me - he would take the phone away from me when I tried to call) and he hasn't been back since.
I don't know how volatile your relationship is, but if he's abusive, that may be all it takes.

