I have a better idea guys, to add to June's suggestion
mb28 I bet a big part of how manipulative he gets is becasue you talk to him ALONE - one on one.
DON'T DO THAT
invite a friend over, or even his own sister. Have them stay the night tehre with you. He wont' bully you if there's someone sle there.. I bet my a$$ he wont' try that.
He's manipulating you mb28. If you are not alone, he wont' try that.
Invite some girlfriends over on your first night there that you expect him to be there and he wont' confront you .. he will just LEAVE and sulk at his mommy's place.
Don't face him alone mb28. I honstly think when you talk to him on the phone or alone in person its just bad news for you.
When you move in, mvoe some friends in there temporarilly with you.