Why would a shy man stare at you shamelessly?

Especially if he's shy? I know shy guys usually stare at you when they think you're not looking.

Anyways, this man stared at me quite unabashedly when we crossed each other in the corridor. I got shy and couldn't even make eye contact with him. I just stared at the floor but I could still see him stare at me from the corner of my eye. What was up with him?
He's usually shy around me.
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Why would he be looking
Why would a shy man stare at you shamelessly?
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