I’ll start off with one, Being upset about a breakup that happened hundreds of years ago.
Edit 1:
- Heath death of the universe, Death of the sun, etc, does not count. I feel like focusing on this is an overused point.
Edit 2:
- Loneliness does not count. I feel like we all know immortality means you’ll miss people and lose them.
Is it: “the age of pussyfoot” https://en.wikipedia.org/wiki/The_Age_of_the_Pussyfoot
That could be it - many elements are familiar, although the title isn’t at all, but I have read a lot of Fredrik Pohl. The plot synopsis also doesn’t mention the characters finding out they had been married before. Maybe that’s a small detail that just stands out more in my mind.