Like many, our social group evolved over time as we drifted away from friends that either weren't growing with us or going in different directions. We still have a core group of long time friends. Most don't live around us anymore, but we still have a great time when we get to see them and it's almost like we've never been apart.
My wife has had more falling outs with friends than I have. Most recently, she cut ties with a person who she considered her BFF for over 20 yrs. The woman and her husband were some of our best friends. We saw them several times a month and they were at the core of our social group at the time.
The husband died suddenly of an aortic aneurysm in 2019 and we were there to help and support her. It was a 2nd (him) or 3rd (her) marriage, but they had been together for 25-30 years. Within 6 months, she was seeing her high school boyfriend from 50 yrs ago who is very different from her husband. For me, he was on ok guy though he tended to steer every conversation to things he "knew" about and he's a know-it-all type. My wife found him handsy - close hugs, lingering touches, etc. - which she hated.
The wife has always been about physical appearances and started disparaging my wife when she decided to stop wearing makeup regularly and let her hair return to its natural color which is medium brown now highlighted with a fair amount of silvery gray. My wife has very good skin and has taken great care if it so she doesn't really need to cover up with makeup. My wife is also a generally happy, outgoing person who likes to do things to make people smile or laugh such as dancing down the store aisle or just being goofy. All these things draw attention, but not the kind the wife wanted - she's a beauty and wants to be seen% as such.
We never realized just how shallow and sometimes ditzy/dumb the wife was when her husband was alive. Remove him and add in the obnoxious boyfriend and the wife seemed to reflect those traits more.
The final straw came after a party we hosted. As the guests were departing and we were finally getting a chance to relax a bit, this couple were the last 2 guests remaining and were hanging out in our game room. My wife had rolled one to share with them and carried it back, but then went back to the kitchen to grab her drink. I don’t partake so I was still cleaning up a few things when my wife came back in and before she could return, the other couple came in and said their goodbyes. After they left, my wife went to retrieve her party materials and they were gone. She asked the wife about it a few days later and the wife claimed ignorance, which may or not be true, and swore her boyfriend would never do such a thing.
It was a relatively small thing and my wife would have gladly given them a party favor if they had asked, but leaving when they did and apparently taking something that was not offered then denying they took it was more than my wife could handle. It's been over a year and they haven't spoken since. This also meant detaching from many of the others in that group.
Frankly, I don’t really miss any of them, except the dead husband. He was a retired SEAL and a really good guy.