Why does he stare at me then look’s away when I notice then when I look back he’s staring again? Why? Any opinions?

For the past year I’ve been working at the mall. This guy also works at the mall as well. Every time he passes by the store he stares at me then looks away. then other times doesn't even acknowledge me. Any opinion's?

Why does he stare at me then look’s away when I notice then when I look back he’s staring again? Why? Any opinions?
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