I'm in a large friendship group of guys, and also a few girlfriends have joined us over the years. I am also in another friendship group, and the two groups mixed at a party. One of the guys from the first group met a girl from another, and decided to start dating her. They ended up engaged with a house.
The girl knew that the guy had a crush on me when we were teenagers (a long, long time ago) because I used to tell her about it, though it took her a bit of time to put two and two together and realise it was that guy.
When she realised, she blocked and deleted me from everything, and stopped coming out to group events if she knew I was there.
She threw a house warming party which I was excluded from (and it basically included both groups of my friends, and I was the only one left out of it) and she was very active in planning things like BBQs and drinks at theirs over the summer as well. In the end I was left out of everything.
I text the guy asking whether there was anything I could do to sort this, because it really hurt - and because we're such busy people, their house (which was nice with lots of room) was kind of being used as our exclusive meetup point, meaning I could never meet with the full group as I was never invited. He text me back and said she felt uncomfortable because we had feelings for each other (used in the present tense - bear in mind I have NEVER had any feelings beyond friendship for this guy, which she knows, and he knows full well and was gutted about for a full decade) so she wouldn't have me in her house where he would just sit and stare at me, pining. This wouldn't happen. A lot of time has passed since we were teenagers.
So I sent him a text saying I hope he'll be happy, and then blocked him from everything.
Apparently he was quite upset, but he can get fucked if he thinks I'm sitting there watching photos pop up of events where they're all having a great time and I'm sitting at home.