Not always the happiest of subjects... but doesn't that cover just totally convey the feeling???
Recently found this anthology, Dumped, a collection of short stories on relationships that end before you want them to. It's edited by B. Delores Max and came out about five years ago. Something like this... I could have used when I was less emotionally equipped to deal with life's challenges.
The anthology has gotten good reviews, and is a combination of both happy and sad stories about being dumped. If not for you, then definitely for a friend who may be going through some things... Because you definitely don't want them standing outside someone's window singing this... But they can sing Chrisette Michele's Be OK!