Friend lunch - not invited

[skgnome]

I’ll start by saying I know I’m probably unreasonable - but I would like a sanity check
old friend from Uni is coming to the city we live
he was very close friends with DH, but I also considered him a good friend (have know him for 15+ years) - I admit, I always was the GF/OH of his friend
anyway he texted DH and a bunch of others (male and female) to say “I’m around, lunch at x…” informal place, everyone paying for themselves
DH mentions it, assuming I was also on the WhatsApp group (I’m not) and when it turns out I’m not on the group - he takes it as I’m not invited, so he’s going for lunch not me
I’m honestly pissed - yes he can have his own friends, and yes he can go for lunch with whoever he decides… but still Sunday lunch! and a large group of mutual friends are invited!
sort of annoyed at friend for not including me, at DH for not inviting me
give it to me straight - I know I’m unreasonable - but what now?

This. We’re not joined at the hip. We’ve been together for decades, and have lots of shared friends, but sometimes I want to see friends without him, and vice versa.

I expect she knows by now whether she was invited.