It's @Kitty's #TuneTuesday, and the theme is #BreakUpOrMakeUp, courtesy of @VestigialLung
Anyway, here you go, a strong contender for the saddest break-up song in popular music right here, if you choose to read it that way, at any rate.
https://songwhip.com/dark-tranquillity/hours-passed-in-exile
(Also one of many nice examples of Brändström's keyboard's out-synthpopping plenty of actual synthpop artists.)