If you get the vibe a guy likes you, why does he never approach?

I get the vibe that a guy really likes me but he doesn’t approach. He seems confident with others, but a bit quiet or doesn’t know what to say with me.

He locks eyes with me a lot and stares from a distance, but why doesn’t he make a move, How do you know if a guy is intimidated by a girl, attached or just not interested?

If you get the vibe a guy likes you, why does he never approach?
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