It's pretty obvious, of course, but it's about the phase of a relationship just before or just after a break-up, when you're about to part ways but haven't quite, where there's still some forlorn hope, when you're hoping that your soon-to-be-ex will join you and fearing that they never will again.
Best break-up song, ever.
It's pretty obvious, of course, but it's about the phase of a relationship just before or just after a break-up, when you're about to part ways but haven't quite, where there's still some forlorn hope, when you're hoping that your soon-to-be-ex will join you and fearing that they never will again.