Why would a guy stare at a girl a lot but not do anything after she approaches him?

Making lots of eye contact from a distance both when alone and in a crowded place. One day I walked up to him and introduced myself, light and casual converation, went smoothly except for some awakward silences, he avoided eye contact and only returned the questions. He hasn't talked me after that, but he told his best friends the same day.
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I should mention that he's an extroverted social guy. He would stare quite openly and expectantly.
Maybe he was just bored? I'm not a pretty girl, I'm slightly boyish and dress like that and don't have any curves.
Why would a guy stare at a girl a lot but not do anything after she approaches him?
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