Why do guys ask girls if they are jealous?

Hello guys, okay so this guy I like has asked me a couple of times now if I'm jealous of girls wanting him and what not. How come he does this? Is he asking because he simply wants to know if I'm afraid of someone else wanting him or? I'm not quite sure.

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Plus! One of my friends on my street was having a party and this boy who asked me if I'm jealous went to it. However, the boy I used to like was at that party and the "jealous" guy knows about that already. When he saw me he told me "guess who I saw this weekend" and I said who and then he said the guy I used to likes name then he said he was going to call me and ask me to come to the party because he was there and I asked him why didn't you he said "he didn't know" and then we ended it there
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could this "jealous" guy possibly like me?
Why do guys ask girls if they are jealous?
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