Lots of people are invited to hen/stag parties but not the actual wedding.
I remember a few people turning up on mine who I'd never met. This obviously isn't the case here.
People are confused because you didn't initially say you go out with them every weekend-that changes things massively.
You should cut your losses, delete your snap thingy and stick with your real friends.
There are going to be groups of friends that are literally impenetrable!
I learnt this myself, was invited to lots of events with them, then 2 of them emigrated and I've been completely dropped, the one <span class="line-through">twat</span> that does most of the arranging isn't very keen on me (genuinely no reason for this) so one my nice 2 left, I got left out.
But no one else put up a fight over it so I clearly wasn't missed <img loading="lazy" class="inline-flex mumsnet-emoji" alt="Wink" src="https://www.mumsnet.com/build/assets/wink-ClU7UaDM.png">
I've let down 'real' friends to do things with this lot as we worked together too which made it worse.
Go and have a nice day with your pal - and fuck that other one off, she uses you wherever she needs too. Don't let her doormat you any longer.
Oh and I actually would text the bride your best wishes for her day too. Become the picture of serenity!