How to tell if a guy is being nice or if he’s interested in you?

I’ve been noticing this guy in my neighborhood (he’s one of the maintenance workers) and whenever we see each other, we lock eyes. I saw him staring at me the other day, I looked away and when I looked back, he was still staring. So I smiled and he smiled back. Ever since then, whenever I see him, we lock eyes and he greets me with either “hello” or “have a nice day”. So do you think he’s just being nice?

How to tell if a guy is being nice or if he’s interested in you?
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