Yes, as Dee mentioned, it is common when alcoholism has progressed.
I would really recommend that you learn as much about alcoholism as you can, not for him, for you. You will be in contact with him one way or another and it's not a bad idea to see what is ahead, so you aren't surprised (if he decides to keep drinking).
I suppose you will find out more about that tomorrow though. Good luck and I hope you stick to your one year boundary, it's so very important for you and the kids.