So I haven't been going out much at all with friends or to clubs or parties or anything recently, as I've been under the weather or broke or not feeling it. Well on NYE boyfriend had to close at work (out at 10:30) and during the late afternoon he mentioned that he was feeling really tired and was planning a quiet night. So I asked him if he would be ok with me going out if I got any invitations, and he said yes.
Surprise surprise, a few distant friends and a club reg (totally platonic at this point, he hosts dinner parties for ladies and their men and stuff) were going to eat at a super authentic sushi place and then mob deep to go to his work friends' party. Of course the bill would be covered and it was a low-key sounding event so I decided I wanted to go to this. He doesn't say anything to imply he was counting on me hanging out, so I went but called him once at the restaurant and once about 5 minutes til midnight from the party.
I left about ten minutes after midnight (only polite at a NYE party) and got home at around 12:40 to him and his buddies drunk and hanging out. We shot the shit and I finally had a beer since I hadn't been drinking and I thought all was ok
But then a few days later we got in an argument about time management with each other and he acted offended that I was out past midnight on NYE. But like I ASKED PERMISSION (which I don't have to do but I'm considerate) and he was just like, "I had no NYE kiss and that sucked. I thought we were just going to cuddle and relax inside, watch the times square thing on TV"
IMO I understand his frustration but last year he hung out with some friends on Christmas Eve more randomly than this and that pissed me off then, so I get it, but like, he said he was fine so that's the only reason I went. Free $60 sushi meal and some lighthearted company. He seemed upset that they weren't even close friends of mine but I don't know, it was a nice change of pace to get out with new people...
Did I do bad? Should I have been more tactful somehow or was he on his period? He's not being a dick and acting resentful still or anything but I think I should know for the future what you ladies might think.

