An alcoholic will only stop drinking if he makes the decision himself. That is true of any form of drug addiction. If he has decided to stick with alcohol rather than you, I am afraid you have lost the man you love anyway. Alcoholics are prepared to lie, cheat and manipulate anyone around them so that they do not have to change their own behaviour. Above all, they lie to themselves. Inevitably they damage other people's health and well being too.
My parents marriage survived until death, because my father became a dry alcoholic until my mother's passing. You can guess the rest, because he followed her two years later.
In my parents case, my Dad needed my mother more than he needed alcohol. I hope the same is true in your case. He has to choose between the woman in his life and the bottle. If he forces you to, you will have to choose between living without him or living with a drunk.
Sorry to be so brutal, but I have lived with this situation close at hand. I feel for you, believe me.