I'm '23F' being excluded from BFs '24m' family events

I '23F' and my BF '24m' have been on and off for 2 years now, we've been steady together for over 7 months, doing therapy and everything to fix the relationship.

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My BF is away at his sister's wedding this weekend. Something I was initially invited to but never confirmed in numbers due to the on and off relationship and him never telling his family we were officially fully back together. His sister found and had everything confirmed with him over a week ago. I'm sad and I'm angry as it's one of the first things we ever talked about when we met 2 years ago but what's really annoyed me is his cousin (22m) brought his uninvited GF (21F) and she's been allowed to go and to participate in all the family events.

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My BF and I have been together longer than they've known each other but there was no mention of me being allowed to come even for the reception. I didn't expect to go to the whole thing as much as I'd loved to and in no way am I angry at or blaming the sister, as I just feel since the cousins GF was allowed to come my BF could have asked yesterday about me. I have tried to talk to my BF about this but I get runaround reasons why he didn't ask or tell the rest of the family about us.

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Am I being dramatic and being an asshole?