How do guys act when they know a girl likes them?

So I was wondering if the guy I like likes me back or if he's just aware that I like him.. Are guys good at telling when girls like them? This guy stares at me from afar and when I'm like walking by too... is it cuz he knows I like him? Also how do they normally act when they kno a girl likes them?
How do guys act when they know a girl likes them?
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