Suggest me a book where a single or not single woman is having an affair with a person who has a partner. She and the person are in love, but the person also loves current partner. (Bonus points if the partner and the person has issues and that’s why they cheated.)

Maybe too specific, but I love the movie waitress, so if you’ve seen that, you know what I’m talking about

Edit: reworded

Suggest me a book where a single woman is In love with a guy who has a partner, and he also loves her, but he also loves his current partner. (Bonus points if the partner and the guy has issues and that’s why he cheated.)

Maybe too specific, but I love the movie waitress, so if you’ve seen that, you know what I’m talking about