Alcoholic boyfriend?

Hi all, I’m a girlfriend to a wonderful man, but I also have a severe anxiety disorder. He likes to drink, I would estimate around 4 tall boys a week or something? However, last night he had 12 reg. Sized beers, he was definitely a little drunk, but not blackout by any means. He’s also 6’4 and around 220 pounds. I come from a family where people rarely drink and I was basically taught that drinking is evil lol. I mentioned it in passing to my mom and she was saying how it’s not normal. I think having 12 beers one night out of the entire 1.5 years we’ve been together isn’t crazy but now I’m overthinking things. He never drinks on work nights, and like I said it’s only around four beers when he does. The only time I’ve ever seen him really drunk since we’ve been together was at a Halloween party last year. So should I be worried about this one time thing or am I just overthinking things like always lol, thank you!