How can I tell if I've peaked his interest?

Anonymous
I see a guy around a lot, but I can't tell if he's glancing at me because he's interested or because he's bored/glances at everyone. I do ignore him so he ignores me too, but before I can take the next step in showing interest, how can I tell if I've peaked his interest?

As a customer I approached him before and he was extremely helpful and polite and attentive, but he could just be doing his job well...
How can I tell if I've peaked his interest?
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