No more Angelina?

Angelina is texting all the time. She smiles sometimes, and the other time she looks nervous. In the first class, she went and sat next to that American boy, but they didn't talk. After our class, I told her that I couldn't come to our meeting on Thursday. She told me maybe it was better to change the time. She wasn't nervous at all, and even doesn't care that much. "You know the course better than the others; please read the documents; we would try to have the meeting before our class." She said. "I am not sure. We will talk about it later." I said. Even when I was talking to her, she was thinking about someone else. She was no longer into me. Then, I left her. I saw her unexpectedly again a few minutes later in another aisle. I surprised because she hadn't left the university yet. I just smiled to her, and she just looked at me like neutrally. I saw her again while she was filling the course registration forms. She probably wanted to register for the next semester. That's why she didn't leave the university soon.I was very unhappy today just because of her. She is not my friend yet, but I feel that I like her and this really bothers me. I don't want to be down because of a trivial issue like this. I wanted her as a friend, but it seems that she is not thinking about me. Maybe it is better to find another friend :(