He is alone because he has chosen alcohol over his wife, his child, his family, and you. That is all his.
And yes, the similarities between addicts and codependents are startling. I look back and it's eerie...I even went through a kind of physical withdrawal from the ex, and you might be as well. But the most important similarity to remember is that there is no such thing as "just one," for you, either.
Rest. Recover. Remember who you are when you're not in the chaos.