Why would a guy just stare and smile without saying anything?

Anonymous

So this guy friend of mine and I were chatting away at a bar last night. It was going great, not awkward or anything, and the conversation died down for a minute. I realized we were just staring and smiling at each other for like ten seconds. I said “what?” And he said “what?” back and laughed. Then someone came up and interrupted us. It felt oddly tense between us, like something was left unsaid. I am admittedly attracted to him. Does it sound like he might be into me too?

Why would a guy just stare and smile without saying anything?
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