After My Target Turned Evil, I Was Locked Away

Any Stories Where the Heroine Is Just Playing Around, but the Hero Falls for Her and Turns Dark?

The heroine has her fun, then goes abroad or disappears. When she comes back later, the hero keeps begging to get back together, but she refuses. He'll do anything for her, while she's cold and heartless. No naive, sugary-sweet heroines!! Transmigrate into a book is fine too. Ideally, the story starts at school!!