Guy friend asked this question and not sure if he is jealous?

I posted a picture of me holding flowers on instagram story and my guy friend commented from whom. I joked asking if he is jealous. He said “lol, just wondering who the hell he is.” Is this a sign of jealousy?

He has been dating and talks about other girls to me so this is why I am unsure why he wants to know.

Guy friend asked this question and not sure if he is jealous?
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