Maybe you booting him out was his bottom. Nothing you did or didn't do made him drink, even he said it was his choice.
From where I'm standing it seems you both have a lot to be grateful for, apologies if you don't see it that way it's my own experience that makes it seem so.
I maybe will feel grateful but at the moment I feel a bit cheated. I am glad he has stopped for his sake. I am glad for his son's sake. I suppose I ma sorry I had ot boot him out for it to happen and I know full well he can never come back cos the same will happen again.
Welcome to SR and take care x
Thanks
x