Why does this girl act so weird around me?

Anonymous
I met this girl in one of my science courses last semester, we were lab partners. It started off kind of friendly but over time there was definitely some intense mutual interest there, only problem was she had a boyfriend back home, about 6 hours away. She never mentioned him until one of our conversations was pointing towards me asking her out. I did end up asking her out towards the end of the semester when we were studying together, but she just looked down and blushed without saying anything. Next time I saw her after that before our final she was standing about 30 feet away staring at me when I was talking to a group of students. After our final I wanted to talk to her so I waited outside and when she saw me she got super nervous and ran away, literally.

This semester she is in another one of my classes and I can't figure her out. She'd be really awkward and nervous around me for no real reason, I'd ask her a non personal and pointed question and she'd look like she was about to have a panic attack. Then the other week I was waiting by myself for one of our class study sessions and when she came into the room and saw me she locked eyes with me and had a huge smile. She sat down next to me and was super excited talking to me. Then the other day before class I was sitting on a bench just outside our class room, just texting on my phone, and when she came around the corner she saw me, looked down and away immediately and walked in a slightly different direction.

I don't follow her around and I don't approach her every time I see her, in fact I've been creating some distance between us because her behavior makes me feel uncomfortable.
Why does this girl act so weird around me?
3 Opinion