I think you’re right that your both just being petty, and it’s just one of those nonsense tiffs people in relationships have over minor things tbh. Saying that, there are a few things which depending on your pov could be suspicious or definitely seem odd.
It’s probably not a major deal, you both just need to calm down and just talk to each other once you have a better sense of why you’re were annoyed and probably ultimately get over it.
Given you’ve been together for a while, it’s odd he would t have told you about the wedding before and when it was, so it would’ve been obvious you probably wouldn’t have been meeting esp if you weren’t going.
Any reason you weren’t going or invited. I’m guessing it’s his friend and they asked last minute?? Or is this something that was already planned, but he didn’t tell you. If he didn’t , then actually that might be a bigger problem in that he didn’t tell you.
I think he tried to call you and just wanted to know how you were etc, like people in relationships do. His reaction about asking him why did seem rude and over the top, so maybe something happened ? You should definitely ask him why he reacted the way he did, because it does sound odd.
If he was still at the wedding or with friends, maybe he just got busy so couldn’t call you back initially or didn’t see it.
I’ve found women can sometimes send a few mixed messages whe saying things like don’t talk to me, but then you actually want them to try an contact you at least. Bit of a generalisation of women I know, but be surprised how common it is so at least he tried.
Simply, both of you need to calm down and talk about it . Share your feelings about not knowing beforehand, and about the call. Also ask him what he was up etc and his take on thing and then see what action to take next.