my thoughts, based on many, many experiences is:
alcoholics don't want to go to therapy because they drink to AVOID anything and everything that they don't want to deal with.
Some cannot express their feelings and drink to loosen up.
Some don't want to feel their feelings and drink to suppress.
The list of reasons I could give here are endless, but all I do know is that after years of allowing my life to be destroyed by the needs, whims, etc. of sick, alcoholic people I finally give a damn about myself so much more than I could ever care about their sickness or issues and have sworn off any and all alcoholics forever.
If he is blaming his drinking on you, he has way, way more issues than drinking that go way, way farther back in his life than you coming along. The issue is HIM, the issue is HIS and his alone. No person causes another person to drink.
He obviously cannot deal with relationships, or stress, or intimacy, or some entire list of crap that has nothing to do with you yet he is putting your name on it.
Don't do this to yourself...this will go on forever.