Would you marry him if he had a mistress he was hiding?
Someone that brought him pleasure and escape.. something he had to hide and deny?
Probably not.
Booze IS his mistress and he isn't giving her up.
Please think about it.
I got married because all my friends were getting married and I wanted a great party, a dress, be the center of attention, feel like an 'adult' finally, etc etc. Those are NOT the reasons to get married. He wasn't an alcoholic either but I still wish I had listened to my gut.
Yours is screaming in your ear right now.