Ladies some advise please?

okay. theres this girl.. i've known her since hs right. But this semester i've gottern to know her. about 3 weeks ago, she told me that she met my gf. but i was like thats my ex gf. So time goes by. and we start hanging out alot. going out ot eat stuff like that. Last sunday she asked me somthing about my ex. i answerd. but what i forgot to tell her is that we got back toghther. I think she found out later that day becuase she's friends with my sister on myspace, and my girl is on her friends list. Okay so i called her twce. no call back. texted twice no call back.. is she mad at me?? i mean everytime we hung out it was always on ther friends level. but i was starting to like her. (wait there more) moday i had a final in this class with her. i get there and she asks me where i'm i going to sit. i tell her "here, by this other girl" but she seemed cool with it, she even talked to me from two seats down while in class. so what do you think it is??? i'm so lost!!!