Well, I live barely 5 minutes away from my second grade cousin with whom I've spent the entire childhood with, and growing adults and both getting jobs we stopped going to concerts together because we developed different friends, and basically our relationship nowadays consists of sending each other funny birthday wishes on each other's birthday, and meeting at the occasional funeral.
It's not THAT hard for a world class musician, busy with touring and family, to not run into an ex band member he doesn't particularly hang out with.