It's hard to watch as they do this to themselves, but I think you are doing well by putting some space between you. He's on his journey and we never know when it will end, and it rarely does until they have had enough. He's paying the consequences for his actions, and that may be the best thing that could be happening to him right now, so don't feel too bad.
Sending hugs and prayers that today will bring you peace.
Hugs
Ann