Books with Bittersweet endings

I was recently chatting with a friend with what we do and don't like in reading. This was a topic that we were happily agreeing upon and also conflicted with. 

Specifically because we both go into books to escape the SHIT that life is. Especially right now with the scary turn some laws have taken with their attack on women and their lives, so why would we read books in MM where there is no happy ending. We don't want real life situations getting in the way. I mean, I do and don't get it. Some people just want... I guess a refresher? I guess... but for both of us, unless it's highly recommended by another good reading friend we both stay away. lol... 

So then I got to thinking how many I have come to read. Which I have read a few bittersweet endings that I just couldn't help but hate to love, you know? I can count them on one hand though. lol

One of them was by Chris T Kat.  I know there are at least two others but... hahaha.. I know the fourth one I DNF-ed it and basically threw it away...

So I'm wondering, which bittersweet stories have you read and even though it broke you and you died a little, lol, which one(s) do you recommend?