Welcome to SR exof! Sorry to hear of all your troubles, a difficult situation. I would have to say that this is definitely not your fault, drinking causes many problems and unfortunately his alcohol issues are beyond your control. Only he will be able to make the decision to quit and get better - which is definitely possible. But you also have to be prepared for the possibility that he will keep drinking. You cannot "fix" him, and as much as you get along well when he's not drinking you cannot stop him from doing so no matter how hard you try - he will have to want to stop for himself.
You might want to check out the friends and family forum here, there are a lot of people there who have been in the same situation as you so they understand. And they can help!
Friends and Family of Alcoholics - SoberRecovery : Alcoholism Drug Addiction Help and Information