Don't accept his blame! Don't wrap it around your heart or keep it in your thoughts.
It may have been a shock to hear him blame you when in fact you know the truth, and a part of you is buying into it and sort of believing him. You don't know he didn't stop drinking and it's really a pointless debate now isn't it. Whether he is or not has nothing at all to do with you and that is what you need to wrap your mind around.