I agree with Aimless. I hope you dont blame yourself. Not everyone is built to take on a lot of emotional angst, especially someone elses. It can all be very overwhelming, especially if you are an addict yourself. It sounds as if you had to draw a boundary with this so that you could keep yourself in a better state.
I imagine he would have had some pretty big problems that had carried over from childhood, and you werent there then during his formative childhood years.. these things build up. He very likely needed a lot more help than he could get from meetings.
I hope you are taking care of yourself today.
_________________
"Caravan is the name of my history, and my life an extraordinary adventure."
~ Amin Maalouf
Taking a break.