I read your posts and i dont see one thing that i'm curious about - what does this person mean to you? is there some past bond or a relationship. It sounds like he is holding you hostage in your own home and somehow emotionally forcing you to take care of him. I just gotta ask Why?
Nothing is going to change in this situation until you do something. Its not going to be a plesant experience but no one can live in a situation like this. Take back your life - leave - so what if he tears up the house - that's just money - your life is more important that the stuff you own. So call the police - have him removed, change the locks - give the keys to the landlord and notify them of the seriousness of the situation so they can protect their property. dont ever look back and dont ever let him know where you have gone.