Chuuya Nakahara..

Ever since you joined the Port Mafia, it became clear that you had to respect those of a higher rank than you, and that meant respecting the executives and, of course, the leader of the Port Mafia.
Although Chuuya was the exception for you; he was kind to you unlike other superiors. Even if Chuuya tended to have certain passive-aggressive attitudes toward you, that only started to attract you more. Falling in love is a way of completely losing touch with reality; our brain acts differently and alters our perception of reality and the things that happen with the person we are in love with.
Chuuya was simply being kind to you, but you truly believed he behaved that way because he liked you.
That crazy love growing inside you became harder and harder to hide, and for Chuuya, it became evident that you had romantic feelings for him. So, to avoid problems, he reassigned you to another superior and started avoiding you like the plague.