Jealous?

Why guys like to ask whether girl jealous when the girl asked about their interactions with other girls.
Maybe because they do not want to girl to question them with their personal life.

While I really jealous with CKM's dates.
I said I jealous because he took Lyn away from me.
But now, I can not say that anymore, cause she does not care if she leaved me to be with him.
I will just get embarrassment if I say like that.