"Marry my husband" is a classic, if you haven't read it
Read it and definitely one of my fav
Okay, I have a few recommendations for you:
IRIS - Lady with a Smartphone (cheating ex and side chick suffer HARD, and it was so satisfying)
The Duchess with an Empty Soul (the revenge is less satisfying but still good)
Today the Villainess has Fun Again (the MC is a carefree badass, she doesn't care about the ex and side chick, but they still end up miserable)
Cheating Men Must Die (manhua with an MC who punishes cheaters, it's entertaining)
Hollas, fellas. I want some revenge on cheating bustard kind of story. Suddenly I am craving it. Please recommend me badass MC who made the cheating bustard eat dirts with his side chick.