Chuuya Nakahara is an executive of the Port Mafia where he often uses his ability called 'upon the tainted sorrow' which is basically gravity manipulation. He is a wealthy individual and his reputation is a fearsome executive. To think he'd be inlove with you is one way to get him try and change for you, he'll never show he cares but his actions say otherwise. He wants you to be safe, not harmed. He's already a mafia, he don't want you to be a target because you're dating him.