Why does he blush whenever I laugh?

There's this guy who I'm aquantices with at work and we work together sometimes. I've noticed that recently when I get the giggles or laugh, he laughs with me or smiles. Sometimes he blushes when he laughs with me. I have noticed that when he stares at me sometimes he will start blushing after a while. I don't usually say or do anything to make this happen.

Why does he blush whenever I laugh?
Why does he blush whenever I laugh?
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