I never really have had that problem since nearly all of the people I've known in all my years here on the ant farm are well rid of me when we go our separate ways and relief, not regret is what they more than not most often feel. If I had a dime for everyone with whom I had lost contact who was happy when we re-established it, I'd have closer to four cents. So much for change I can believe in.
I'm on a message board of an organization I was in a long time, well over three decades ago, with hundreds of members from various eras with cohorts and generations of folks who worked in all aspects of the operation. Some people worked there for many years, spanning decades and are touchstones for a lot of us who don't really have a lot else in common. It's nice, but it can set you up to get hurt if you don't tread lightly.
One of the group posters, who is (and this will surprise you) considerably older than I am, shared that he's about to return to the workforce (in this case, radio broadcasting). He's very much old-school, with a great voice and terrific phrasing, very important a generation or two of broadcasting ago.
I was discomfited years ago to discover he was nothing like the icon I had admired professionally for decades when through our joint membership in the group, I had the opportunity to get to know him as someone beyond the microphone. Crestfallen might be a word I'd use, or chastened by the encounters and I avoided his postings by not dropping by the group board.
So in recent days when I had a note from another former colleague asking me about the pending 'return to the arena' I had to catch up on a lot of postings including one announcing he was "...ready to kick a$$ again." I hope he does but perhaps on his way to the studio that first day 'back' he'll pass a river, not unlike one of the three that runs through my current hometown that will give him pause and food for thought.