Why would a guy be too shy to talk to an innocent easy-going girl?

Why would a guy be shy around a girl that's not even intimidating? A girl that doesn't discriminate & is always kind to people. I mean can't a guy that's so interested in a certain girl look at her and can tell that she may not be so hard to talk to or to impress.
Why would a guy be too shy to talk to an innocent easy-going girl?
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