[CuriousRose]

Not to this degree, but I would certainly draw the line of assistance if he gets violent or threatening. Someone that is rapidly at that stage toward a close friend is not in a mental state that is salvageable unless you have experience or are a mental health professional. I would personally begin to move possessions of value (sentimental or otherwise) to a safe place like a storage locker, away from any outbursts and look to find an alternative place of residence if things get worse. Probably not the interventionist kind of answer you want to hear, but your priority should be protecting yourself.