Help with a Girl Problem, I really need advice..?

Ok so I am in my second semester of college. I just transferred and in one of my classes I have around 15-20 people in it. So after the 2nd class, I go home and find I have been requested as someones friend on facebook. Its this girl that stared at me coming into the class, and I guess she got my name off the attendance sheet and friended me. I mean I never sat next to her or even talked to her once, but she still found out my name and friended me. She sent me some messages on facebook and said to talk in class and whatever. So the past 2 classes, I have been sitting next to her and we have been talking after class until we reach our next classes. The thing is, it says she has a boyfriend on facebook at another school in the country and were together before college and now still are, yet what the deal with me then? And her main facebook picture is of her and her boyfriend, and she has a bunch of pics with her boyfriend Its making zero sense, i Then she asked me for my number 2 days ago afer class and said she will call me or text me to do something soon. Then i texted her happy birthday yesterday when it was her birthday and she didnt reply. Whats going onnHelp with a Girl Problem, I really need advice..?
The concept of 'boyfriend' is extremely flexible for women. Many times they will tell you they have one, just so they don't appear unlovable. It sounds like she has a real person as a boyfriend at least. It sounds like they've drifted apart, at least a little. Maybe she is looking for you as a friends, and maybe she's considering ';trading up'; the same way guys do. If you're interested in HER, move forward in a romantic direction (without turning into a wuss.) Until she has a ring on her finger, she's ';fair game';.