Partner [26M] got too drunk to follow through with my [27f] birthday plans [need advice]

I had asked my partner (27m) to plan me (28f) a cookout for my birthday at a family members house. A week before he was insisting a relative come spend the weekend at our place with a friend that makes me extremely uncomfortable. Said friend is not a girl’s girl and is not someone I would like to be keeping an eye on during my birthday. He disinvited the friend after I expressed my concerns and the relative decided not to come. A few hours before dinner the night before my birthday, the relative showed up (without the friend but my partner failed to let me know earlier in the day they were on their way, not a huge deal as they are always welcome in my home, but still an unexpected surprise). The plan was to wake up at 6am the next day to go get everything ready for the party. I had bought a bottle to drink at the party, but him and his relative ended up drinking all of it that night. I am not a huge drinker and end up being the babysitter for him and my friends most of the time, but I wanted to let loose the following day. I begged him to slow down, please come to bed, and that ended in an argument. He finally settled down at 2am, when I woke him up at 6 he refused to move, obviously still drunk. We were about 3 hours late leaving to get the stuff needed for the cookout (we had family waiting to be picked up so they could help us with this so it wasn’t just me being affected). He was cold with me all morning. Didn’t wish me a happy birthday all day. And didn’t help with any of the stuff he planned with other family members like he said he would. We’ve been together for 3 years and have been talking about getting married. I have never asked him to plan anything special and he hasn’t ever taken it upon himself to do so. He never did anything for me on previous birthdays, even though I always make his a big deal and make sure to do something special. I just wanted to spend time with both of our families and I feel like an idiot for even asking. I’ve attempted to talk to him about it and he keeps saying “it all worked out anyways, so what’s the big deal” but he literally was too hungover to help with anything he planned with everyone else. I didn’t ask THEM to throw me a party, I asked HIM. I’m having seconds thoughts about marrying him because if he can choose alcohol over me on my birthday, I can’t imagine what he will do on our wedding night or anything else we do in the future. Overall he is a great person and there’s a reason we’ve been together for this amount of time. But how am I supposed to move forward with the rest of our lives knowing that this type of issue could very well occur again? Is it even worth entertaining or should I just walk away? AITAH?