I’ve been thinking about this for a while now. Way back when, people would just lose touch with each other, as they moved away due to new jobs, etc. There was no question of trying to contact someone you knew a long time ago, unless you wanted to call their parents and face some embarrassing questions!
Now there’s Google. Something will trip a memory, and all of a sudden you find yourself Googling your ex-boyfriend or ex-girlfriend. Just “because”... Idle curiosity? Maybe. But once you find them, then what? Do you reach out in the name of friendship? What if you’re married? Do you tell your spouse about this? What if that person is single?