How do guys smile at attractive girls (that the don’t know) when waking past them?

There’s this guy who always smiles at me when we make eye contact, and he gives me small closed mouth smiles. When I look at him he’s already looking at me.
And I’m wondering if this is just the way he smiles or it’s just a smiles you guys give a girl when they think she’s weird for staring at him LOL or just a girl you think is pretty but don’t know at all. .
And we do have this non verbal flirty thing going on. But I thought guys showed teeth when smiling at girls they like/find attractive/ or are interested in.
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Yeah I always plan on saying hi then I chicken out haha
How do guys smile at attractive girls (that the don’t know) when waking past them?
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