Hasn't the point here been It's not for you or anyone else to CHANGE anyone?. You keep coming back with "I want to help him get sober, I want him to change. You just NOW posted "I don't want to keep berating him for drinking, but I don't want to ignore it and pretend all is fine."
Iwant...the drunk who lets you down is who YOU have CHOSEN. There is NOTHING to change. That's who you have. That's ACCEPTANCE.