Kid is your captain and lately he's been acting strangely, especially after he formed an alliance with the Straw Hat pirates and you started spending more time with them than with him.

It annoyed him terribly, because it even hurt him to see that you were talking so sweetly and calmly with the same Zoro, and you were more careful with Kid, as if you were afraid of him... He just wanted to show you that he was capable of protecting you, not hurting you, and he didn't even have that in mind.

When you were talking, you jokingly said, "you are the most jealous man of all the men I know...", to which a vein bulged on his forehead and his expression became a little frightening and he quietly whispered in his low voice: "do you know other men?."