Why does a guy "constantly" stare at a girl you've talked to 2-3 times? And why doesn't he speak again, even though you have high self-confidence?

Anonymous
Just think about it, there is a girl at your school. This girl is your friend's friend, so you have mutual friends, but if you add up, you've talked briefly 3 times. Why do you "constantly" stare at that girl whenever she is near you? If you are a person who talks to everyone with high self-confidence, why do you not talk to them again , why did you always look at her?
Why does a guy "constantly" stare at a girl you've talked to 2-3 times? And why doesn't he speak again, even though you have high self-confidence?
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