I would suggest being up front with him and discussing the problem you are facing. The added pressure of not drinking to keep him may just lead you to drink.... If he is aware of alcoholic behavior in his family he understands how hard it is for you to control the alcoholic animal living inside you. My ex-wife was in a similar situation, she came from a family of 2 alcoholics (recovering long-timers now) and she sought AlAnon which helped her with them and me immensely. She saw me fighting the battle with my alcoholic-inside and even though while I was out there I didn't want her support it was always there. I think that if your boyfriend understands what you are going through and he really loves you, he will be there to walk with you without ultimatums. If he can't then that is his choice and that is just one more thing that you have to give to god and realize that you cannot control. I was told to get sober for myself first then the rest will work out, one way or the other....