What does it mean when a guy talks to his friends about your crush on him but gets possessive and jealous when you flirt with other guys?

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What does it mean when a guy talks to his friends about your crush on him but gets possessive and jealous when you flirt with other guys?
So this guys knows that I have a crush on him and we flirt a lot etc but I realised that he talks to his friends about me and my crush on him. For example whenever him and his friends are around me it kind of feels like his friends are making fun of me and he doesn't trying to stop them like... he's just standing there with them smiling at them with a kind of naughty look.
The thing is that this guy is kind of popular with girls ( or at least he's trying to be). So I don't understand what's the point of having me around... he also gets very possessive when I flirt with other guys but gets extremely happy when he thinks I'm jealous.
I think he wants me to make the first move but I don't know if it's worth it like I don't even think he likes me... what are your thoughts?
What does it mean when a guy talks to his friends about your crush on him but gets possessive and jealous when you flirt with other guys?
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