Hero catches feelings and think he is sick

I am looking for something I have never seen in a book I think, I don’t know if it exists

Imagine a hero raised in a strict order or academy where love is taught to be a weakness—a kind of “emotional inoculation.” When he unexpectedly finds himself drawn to the FMC, he’s convinced that his newfound feelings are a symptom of a disease or curse. In moments of panic, he confides in his close friends, who tease him while trying to help him understand that love might be less of a sickness and more of something transformative.

Any books or even fanfiction if you have something that could be similar to this

I really love fantasy for the moment! 🤭

Thank you 🙏