We always come back...until we don't.
I just came back in December. Hadn't played since 2017. It's fun but also bittersweet.
I came back in February after having been gone for well over a decade and feel the same (only here for my kids and nostalgia).
I actually somewhat planned my exit in that I dropped most of my accounts/houses (staged some IDOCs for friends/guildmates), but I had kept one account open, just piddling around (it was around my first kid being born, so I had long stretches of holding him while messing around in UO).
I did not realize that the last time that I logged on to UO over a decade ago was going to be the last time I logged into UO for over a decade. It just happened.