Five- year relationship ended just over 2.5 years ago, when he turned cold out of the blue, said some horrible things to me and dumped me over the phone. We have mutual acquaintances through our hobby - cycling. A few months after breakup I was added to a WhatsApp group with some of these people, about 15 in total, but he wasn't on it. Don't know if he's on another or not - don't care either as, although I wasn't myself for a long time after breakup, am in a relatively good place now.
To be honest, a lot of these people are younger than me - by about 10 years or more in some cases, however I appreciated the gesture at the time. For different reasons, I haven't got as much out of the group as I'd expected and participate only occasionally, both in the group chat/ cycling days. I'm 40s, they're all mainly 30s.
One of the gus recently posted a photo of the group with my ex in it, and it really unsettled me - probably because I haven't seen him in almost a year. I know they're entitled to meet up with him and entitled to post photos, but I really don't want to see him. I feel it's set me back a bit. I'm thinking of exiting the WhatsApp chat - or would this be a silly thing to do?