I was married to a recovering alcholic for 10 yrs. 3 yrs after we married he started drinking again. I lost my soulmate the day he started again. there would be short periods of time he would stop again then start back up again. this went on for 6 yrs. he became violent. that lasted a couple of years. one day I just could not take it anymore. I had to leave. that was in 97. his drinking continued then non stop. he died in 02. there was no hope left at that point. I feel guilty that I didn't do enough to make him stop at times but then I realize that our love for each other was not enough to make him stop either. you can't make him stop and you can't force him into any kind of treatment.
I also have a brother that is now seperated from his wife for the same stuff. unless your bf wants to stop there is nothing you or anyone can do except pray. me personally would not go back to him at this time. I would tell him that until he has had a long period of sobriety it won't work. good luck in whatever decision you make.