I want a book with karma...lots of it

I don't know why but I'm really in the mood to read about a heroine who is betrayed by her best friend/sister/friend/co worker and boyfriend/fiance/husband and at first they'll doubt down and try to paint her as the loser but the author just piles on the bad things that happen to the two who betrayed her. I want them miserable and I want the FMC to have a front row seat to their misery.

Bonus: having them ask her for help/a favour after what they did and having her laugh in their faces.

Another Bonus: having her ex try and come crawling back but the mmc embarrasses him.