Stop organizing events and I stopped getting included
A few years back I was organizing a social club.
It was fairly popular and a great way for people to actually make friends while exploring the city/activity.
And people actually did make friends, people that would hang outside the club activities and that included me.
Had a group of friends who I would hang with, celebrate birthdays with, go out, even invited on an international trip.
Eventually I closed the social group because I had a good run with it and just was getting burned out (and no one had ever offered to help, so there was no one to turn it over to).
As time went on I saw less of these friends, and just assumed it was because we weren't doing any organized events.
But then I realized they were doing things without me.
A friend got engaged and left town and I found out about it secondhand, and didn't even get invited to a going away hang at a brewery. They liked the book clubs that I organized so made their own. Right now they're having WC watching parties.
And the worst thing is that when I do see them at one of the rare things im invited, we are super friendly, like nothing has changed. Sometimes they'll even say "Haven't seen you in a while!" We seem to get along.
I'm lucky where I have other friends and activities that fulfill me so I dont dwell on it, and logically understand that people come and go in your life but when I'm around them (yesterday was one of their bday celebration who continues to make some effort to keep in touch) and they mention all the things they are doing together it stings.
Also organizing the club was a lot of work and often thankless and there's a small part of me that is (wrongly) bitter because they wouldn't even know each other without me.