EMERGENCY PLEASE HELP!! I’ll answer your questions after I answer yours?

Why do guys look at a girl many times and each time as soon as she looks at him they stare a little bit for a few seconds and then he looks down, what does this mean? And when ever they pass eachother after sixth period they stare at eachother, what does this mean?
EMERGENCY PLEASE HELP!! I’ll answer your questions after I answer yours?
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