I totally understand how you feel 
we had a similar thing recently, I text family member saying are you at 'x' and got no reply so guessing it was a yes.
I would say if it was just them, then I wouldn't be so bothered. If other family was there then I would be.
He gets some brownie points for texting a photo. If you're open with him, ask why you weren't there. If not consider numbers, how they wanted it to be small and intimate, how if they invited you then they'd have to invite someone from brides family that they don't like. There's loads of possibilities.
I've not RTFT but if it was a proper big day you have every right to be annoyed. The sad thing is when some men / women have a partner they change, dynamics change, there's little you can do.
I would advocate spoiling yourself to feel better, get a bottle of your favourite tipple and have a few nights of relaxing me time, depending on whether you're buying wine or vodka. The latter in one night might not be a good idea 
Hope you feel better soon.