My boyfriend and I have been together since I was 14 and I love him but sometimes he does something bad to me and I really need advice

Hi!! I'm not sure how to word this or who to tell but I want advice. My boyfriend is a few years older than me and we have been together since I was 14. He was my first and he takes great care of me, especially in bed. He's very gentle and sweet, always tells me he loves me and recently on my 17 birthday we moved into an apartment together. It has been a dream come true, we do everything together and it has truly brought us closer. My boyfriend is 21 now and he started to drink.. Not often but maybe once a week? And when he drinks he gets hammered and then he passes out in our bed in just his shorts. Not a big deal though, I just climb in bed with him later on and fall asleep beside him.