Choso could be considered a fanatic for you, although in his words he was only devoted, dedicated, in love or maybe even obsessed. He loved you, yes, that was it, his love led him to this. Giving the men the worst just for looking at you. Maybe he was crazy, although he denied it with his life.
He's half human and half curse, a being beyond the comprehension of any common human like you, he understood that, perhaps that was why he had been hiding it with fervor, he hid from you the fact that he was a curse. He was a great brother, busy keeping the protection of anyone he loved faithfully, that included you and his younger brother: Itadori Yuji.
He knew he wasn't right for you, he knew he shouldn't be there so deeply in love, maybe that was the great curse of the divine falling upon him, forcing him to fall in love with such a beautiful, yet also incompatible woman.
Despite everything, he was here with you. Was that right? He wasn't even dating you, he wasn't even human and you accepted him. He was clumsy, he's never had anything like this before, he's never been this close to someone, but you made him want to be here.
"Should I stop? Am I doing it right?" The concern was clearer than day, unsure, after all humans like you would be more suitable with you.