Please learn that when someone is drowning in their mental illness issues like this, it's like trying to rescue someone from drowning, they can literally pull you under and drown you while thrashing around.

You are simply not qualified to handle this challenge. It's not a way to try and make up for how you were in your past either. You are not being mean by cutting him off either. It doesn't matter what he says either, he is a very mentally ill individual, he is clearly drowning and dangerous and extremely destructive.