Has she changed?

I know a girl and I can she is my very good friend. We study in the same college. I had a crush on her since I first saw her. But didn't had the courage to say that to her. Things went on... But since 6-7 months I have come more closer to her. I share everything with her and she also do. We have became kind of best friends. I even told her that I like her and asked her out. But she can't expect me as a boyfriend. I was heart broken after that but still she was the one who kept things good between us. She knows about all my feelings for her. And that's why she is my best friend.

Although, sometimes I find her behavior quite weird. When she's with her friends, she doesn't talk to me. She completely ignores me. That makes me sad. I asked her why she do that and she always says that thats the kind of girl she is. Then, she starts giving me examples of her old friends with whom she do the same. Quite weird!! I do mind it sometime but somehow she makes up for that.

Since a week or so ago, I found her in bad mood and asked her the reason. I know that it might be because of her boyfriend, who doesn't live in the town. She didn't tell me anything. She didn't even talked to me properly. The very next day we have to meet somewhere for some important project. Again, she was sad. She didn't even talked to me. I was trying to talk to her but she was almost ignoring me. That night I called her and talked to her about what's going wrong with her. I made some harsh words on her relationship. She told me everything about the problem.

The next morning we met at college, I was sitting next to her and tried to talk to her. But she said that she has some work to do and started doing it. Then some of her friends came over there. She then stopped her work and started talking, laughing with them. That disappointed me. But she didn't even looked at me.

For the next 3 days we didn't talk. The 4th day I got a call from her and she was normal. I didn't ask her why she didn't talk to me all those days. The next day when I met her in college, the same thing happened. She ignored me while with other guys of my class she was quite comfortable. At night again she called me and we talked like for an hour. I still didn't ask her the reason for her behavior though it bothers me a lot.

Today, she again didn't talk to me and ignored me. I am totally confused about her. She is normal on the phone but ignores me when I am in front of her. She talks with everyone except me. That hurts me a lot.

Has she changed or what? What's going on with her? Does she want to end the friendship? I am confused.