What does it mean if guy gets uncomfortable around a girl?

Anonymous
I have only met this guy a couple of times and recently he treated / acted different around me then with everyone else, regardless of how long he has known them. With other girls and guys he is himself, confident, outgoing and at ease. Meanwhiile towards me it appeared that he was quiet, reserved and a bit tense. Why can't he be himself around me?
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What does it mean if guy gets uncomfortable around a girl?
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