Pigtails, I commend you for staying sober amidst a familiar scene with friends and family, at parties and at bars. My drinking began in those types of situations, but when I moved away from all my friends (most of whom I drank with often) and basically didn't have a social life, I began to drink at home alone. So while it's hard for me not to drink now, I can imagine how hard it will be when I go home for a visit and I'm in those situations. That really shows your commitment and determination.
As far as your boyfriend is concerned, I agree with the others that change is just hard. It sounds like you have good communication and hopefully that will help you understand each other better as time goes on.