It's annoying because of how the story presents it without consequences (so far), if it was balls to the walls kinky it would be a bit more understandable. The story tries so hard to make it seem there's logic in the plot when there isn't, and no logic isn't necessarily a bad thing, it's when it's conveyed so badly that it becomes annoying.
An evil character makes us want to read more about them and their story, an annoying character makes us not want to read about them.
HAH
Unlike the other two commentators who bring logic to their rationale why they dislike this story, you make dumb assertions that prove just how immature you are.
If you can't separate fiction from reality, you clearly shouldn't be reading stories like this. Go tell all those people who read Killing Stalking that they're simps for a murderer. You'll be laughed out as a fool.
All of us know that cheating makes you a trashy person. But hello? It's fiction. It ain't real. No living breathing human being is being hurt.
It's the same concept as a student teacher relationship. IRL it's fucking disgusting, but we know the story is fiction using cartoon characters. Why take it any more seriously than porn?