on the fading connection and monetization - you could let people pay to re-up the connection from fading as opposed to meeting in person again first, and its makes them really think about whether meeting in person is worth happening again or would ever happen again, is the connection itself valuable in another way any way

on instagram, there is a social disincentive to unfollow people and you can also make someone else unfollow you in a couple ways (the button that does just that, as well as blocking someone for a second and unblocking them), doing these actions has a real cost to confrontation. people you thought you would never see again will see you again and say "I thought we were following each other???? oooo :O ... ooooh >:O"

you are making that activity a first class citizen, with no presumption of ill will behind it, this has value to it