You’re reading a romance novel or one with a major romantic subplot and then the designated love interest of the female (or male) protagonist does something that hurts the protagonist and you hate them for it, and wish they didn’t end up together… but sure, they end up together.
Due to the nature of this discussion, spoilers from the books are included.
Example of how to write:
Gideon de Villiers from The Ruby Red Trilogy.
>!spoiler here!
Omg yes, I’d forgotten that! Also the book hypes Denna up as being really wise and always able to see through Kvothe but then thinks it’s a good idea in the first book to stick a random substance she finds in an abandoned house in her mouth, which turns out to be poisonous and then Kvothe has to spend several chapters taking care of her and making her eat charcoal because there are no doctors around for miles. So wise!