HP123,
You cant carry on like this, it will come to a head sooner or later. Why are you covering up for him? He blames his addiction on your marriage problems, therefore you blame yourself for his addiction. You may be married but its his debt, not yours! Stop feeling guilty. Remember your first responsibility is to yourself and your children, I think you've lost sight of this as you've been so distracted covering up for him and keeping up appearances that everythings o.k. I hope it goes well for you talking to GA,
good luck.