Chuuya Nakahara..

From the moment 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 sometimes had somewhat passive-aggressive attitudes towards you, that only made you more attracted to him. Falling in love is a way of losing all sense of reality; our brain works differently and alters our perception of reality and the things that happen to us with this person we're in love with.
Chuuya was just being nice to you, and you genuinely believed he was acting this way because he liked you.
That crazy love that was growing inside you became increasingly difficult to hide, and it was obvious to Chuuya that you had romantic feelings for him, so, to avoid problems, he reassigned you to another superior and began to avoid you like the plague.