Why do girls do a sideways glance?

TheMoose
okay supposedly im an intimidating guy whatever. Anyways why do girls do this sideways stare towards me. I just dont get it. If i catch them looking at me and i look back all of a sudden they look at the floor or wall. Then the ones who dont stare do this thing where your non existant ( I get it i do it 2) then all of a sudden i catch them doing some sideways glare. What the hell is this?
Why do girls do a sideways glance?
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