A guy smiles at me when I laugh?

I went on a trip with my college to NYC here a week ago. My college took two vans there and I was in the same van as this one guy. He sat in front of me and whenever I would laugh and smile he would turn around and smile at me. What does this mean? Also on the way back we talked for several hours and he kept asking me questions about myself.
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Why is he smiling at me when I laugh?
A guy smiles at me when I laugh?
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