What are signs a shy guy likes you vs. when a shy guy does not like you?

I have heard people say some signs shy guys like you are they avoid you, avoid eye contact act really nervous in your presence and do not talk to you but aren't those also signs a shy guy does not like you? So how can you tell the difference when a shy guy likes you vs. does not like you?

What are signs a shy guy likes you vs. when a shy guy does not like you?
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