Why would she show Interest so much and then rejected me?

Gabriel123
Why would she show Interest so much and then rejected me?

I had classes with this girl once in college. She would always look in my eyes, smirk at times, etc. I never got the opportunity to ask her out because she would show interest and at times will act uninterested. This last semester she will notice me around her and will pretend to be on the phone. I walk in front of her she will look straight. Other days she will walk across me and look from her corner of her eyes. I saw her once in the hallway texting and she turn to look at me and quickly look back at her phone. I found her on snapchat and we talk for awhile, she said she forgot about the class but when I mention the teacher she tells me it sounds familiar. The conversation ended short because she had to study for finals. Last Friday I sent her what are you doing? How was finals? She open them but never replied. She does look at my snapchat stories. I'm positive she knows who I am, we seen each other so much since 2014 I sure she remembers me. On instagram she has no pics with no guy or dating anyone so I assume she is single. If she claims she as a boyfriend why does she kept looking from the corner of her eyes? Or walking back and fourth in front of me? I know many people are going to say she is uninterested but a person who knows her somewhat told me she does that a lot she tends not reply or ignore messages from friends, etc. Should I keep texting her? If so how do I make a conversation interesting and fun without being boring? I feel like I wasted my time on this girl, feel like she only wanted my attention
Why would she show Interest so much and then rejected me?
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