Just an update:
My boyfriend initiated our conversation about out relationship yesterday as he sensed my frustration about his drinking over our anniversary trip. The conversation ended in us breaking up which was very hard for me as I still love him. I decided to leave because he told me straight up that he feels that he doesn't have a drinking problem and that he doesn't know if he ever wants to change. This destroyed me and was also a wake up call for me to leave.
I know that me leaving was the right thing, but I still miss and love him so much. All day the thought of "maybe his drinking isn't that bad" keeps creeping in my mind, and I fight it off every time but it is difficult to do.