Why does he seem nervous when he talks to me?

There's this guy that every time we're talking he's always fidgeting and seems nervous. Today I was staring at something in the ground and he moved next to where I was staring I'm guessing because I wasn't looking at him. Does he like me? How can I tell if he likes me? It's really hard to tell because he's really friendly to everyone, but yet he doesn't fidget when he talks to other girls.
Why does he seem nervous when he talks to me?
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