I agree with the others - he needs to go ASAP. There's no hope in this person what so ever. Make sure you don't buy him marijuana anymore - you could get in trouble for that. He sounds emotionally cruel and why should you hide away while he has free reign over the rest of the living space. Have someone with you when you tell him to leave in case he becomes hard to handle. I wouldn't feel safe with him there. Such a loser.