A girl behaving pretty strange?

Gagarin
This question is more addressed to girls.

Ok, about me: I'm a 22 year old guy ... I don't have much experience with girls. I usually don't try to "pick up" girls that I don't know.

So there is this girl I've seen a couple of times at the bus stop. I don't know her, she doesn't know me. In one particular day of the week we take the same bus. Last week at the bus stop I walked past her, looked at her, she looked back at me for a brief moment. I stopped somewhere behind her to wait for the bus. Then I noticed with the corner of my eye that she turned around at me, our eyes met for of brief moment, then she turns around and WALKS AWAY... actually she just walked like 15 feet until I couldn't see her anymore because she was behind a shop (having nowhere else to go because she was also waiting for the bus).

I didn't really think about this girl until yesterday when I saw her again at the same time and at the same place. As I approached the bus stop I suddenly saw her, she looked at me, then again SHE TURNS HER BACK AND WALKS AWAY... again like 15 feet until she's out of sight. To me it just looks like a major sign of rejection but why would she do that? I don't know her, I didn't say anything, it was just a brief eye contact! Then as we get into the bus we were facing each other; she was like 15 feet away from me. She looked at me a couple of times then just kept looking out of the window biting her bottom lip all of the time (like an anxious biting not a sexy biting), and talking on the phone with like 3 different people. (I must point out that I NEVER stared at her to scare her or anything; also I look very peaceful... I probably wouldn't even notice her if she wasn't acting so weird)

I really don't know how am I supposed to interpret her behavior... that's why I'm asking for advice; how do other girls see this? The fact is that this girl is really pretty and I would like to talk to her... too bad she's so strange. She probably doesn't like me... but why be so nervous then?
A girl behaving pretty strange?
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