Everything Husky Lover said and then some!
Your 'd'h behaved appallingly! In fact I would be wondering how much effort he really put into finding two tickets or an extra ticket for you! I think he knew fine well that the likelihood of getting another ticket was slim. If that was my dh, he would have found us something else to do, taken me out for a meal and we would possibly have met up with friends later.
If things have been strained between you, do you think this was a two fingers up to you, I would rather spend time with my mates situation?
The constant selfie uploads definitely makes me think he deliberately wanted to rub your face in it.
Fwiw, I have no problem with my dh going out with friends, as OP has hinted herself. However to be looking forward to a night out together, only for him to buy one ticket knowing fine well he would be unlikely to get another, then to be dumped as he swanned out with friends would be awful! You have every right to be hurt OP!
I do agree with the poster who suggested making sure to have friends outside of your h's social group! I would be thinking hard about just how good my relationship was too! For my dh to care so little about my feelings!
I would post again in relationships OP, it sounds like you really need support and kindness (AIBU is a little too brutally honest for that).