The only advice I would give you from experience with people who have mental health problems who take drugs is that the abuse of drugs and alcohol only make them worse. The moods, the aggression, the abuse all get worse if they aren’t ready to change or get help. I believe the person who emotionally (and eventually physically abused me) did love me but his idea of love was totally different to mine and it was a selfish love.
It sounds like he’s emotionally nasty to you and aggressive towards you and that is concerning, especially the fact that it has already or physical.
I agree with supporting someone who is trying to get themselves out of a rut but You might need to get away from the situation for your own safety and happiness if he isn’t willing to help himself.
It sounds like you have given everything you can and should. He is responsible for his own recovery, not you. As a friend living apart, you could still encourage him to see his GP.