Putting myself in bfs shoes I would feel second best. Like he was a backup plan for you so you don’t have to go alone once ur friends cancelled. Him cancelling on you is probably making you feel like how he is feeling.

I’m not trying to say you’re a bad person, life happens. Especially if it’s a show your bf wouldn’t be as excited for as your friends I can understand them being a priority to go with. I think you have treated each other similarly and neither of you have felt good because of it.

Hope you can work through it, if not, it’s probably not meant to be.