Should I forget about her?

I hung out with this girl from my class a couple of times. We usually hung out after class was over, and ever since the first time we talked we kicked it off right away. It turned out we had a lot in common and I really started to like her. She also liked me, (she told me). But lately things got a bit weird, and it felt that she was backing off. She kept on saying I'll text you, but never did. I asked once when are you free this week, she said she is very busy. And once while we were hanging out around campus, I asked if she wanted to chill, she said no I have to go... Ever since this occurred, I kind of felt hurt that she doesn't want to hang out anymore, or that she doesn't like me, because I really like her and I do not want for this to happen. However, I decided to let it go before getting hurt even more. I am not talking to her at all, no text, no communication, even though she is in my class. I usually waited for her after class, but not anymore. But the thing is she hasn't hit me up at all. Does that mean she's over me? and didn't even give a **** about what we had together, which I thought was great. Should I do something about it, or just forget it all?