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He might find himself staring at you, and if you look back, he might feel self conscious and look away. He might actually get tense and nervous when you come around, especially if you talk to him.
He'll try to sit close, but not too close to you. He'll look at you alot, he'll probably fiddle with something if he's nervous, he might talk a lot or a little depending on what he does more of when nervous. he'll open up more as he gets more comfortable around you though, and may start breaking the touch barrier and giving a playful touch on the arm or back to show their interest because they're too shy to compliment you or do similar flirting strategies.