Understanding a girl's behavior is difficult, help?

Hi girls, So recently I was passing by this cute girl. She saw me from a distance already. Got closer, and she looked in my direction but not at me, as if looking peripherally. She had a little smile on her face, my guts said she checked me out. And then she turned around. And turned back exactly when i just passed her. Now isn't that rocket science? Help.

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I usually get a lot of stares and attention from girls. I'm 6'4 and assuming that I'm good looking.
Understanding a girl's behavior is difficult, help?
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