I second lexie
Alcoholics drink thats what they do .
I used to have the same fantasy thinking as you (not intended to be belittling) just that ive been there before. I thought I could "help" or "cure" my ah. Wow was that notion senseless.
Honestly its painful but without any ties (no kids. House. Etc) this was a blessing. Even if right now it hurts...later down the road youll see it. You didn't fail because you couldnt save him and your friends are right....you should stop communication.
You have a full life ahead of you