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!
I don’t read a lot of romance, but there is a very early sex scene in the Outlander series that makes you go… “and she stayed???”
Obviously, the relationship grows and gets way more loving and way better as the series goes on, but I cannot believe how Claire handled the situation. (Yes, I know she literally had no choices, but I still felt like the author had gone too far.)