am I wrong for this?

lv
so it's NYE and since I'm away from home I assumed i would be spending the night with my SO but he is choosing to go to his boys house for a little party without me. We talked earlier and I was under the impression that we would be doing something together because that's what he made it seem like. So now I'm sitting here in my apartment alone with no plans because all my friends are back home and the ones I made out here went home and I'm honestly so pissed off and upset. Am I wrong for feeling this way? He would rather hang out tmrw instead of today and I just don't want that.