"If I try to confront him directly he walks away and won't speak to me."
Denial is one of the symptoms of Alcoholism and blaming someone or something else for why they drink is another. Here is something you need to think about and that is you can not stop him from drinking it has to come from him and only him. So many of us here suffer from trying to detach so we are trying to recover ourselves.
Be good to yourself and to him because your thinking is a lot clearer than his that's why you found this site.