If a girl is "nice" to you all of a sudden?

Anonymous
This girl is kinda freaking me out lol. So I asked her out, she declined. I've known her for a couple of months. I thought she liked me because she would treat me differently than other guys. While with other people she was talkative, nice and really sweet, with me she was a bit quiet and nervous, sarcastic and would tease me and argue playfully with me and every time I tried to make her laugh, she would tell me how unfunny I was. After I asked her out, she turned into a different girl. Now she is very talkative and she starts conversations and even told me that (gasp) I was funny. We still tease each other and argue a lot, but why is she being all nice? I have no interest in being "just friends", I have tried to stop talking to her, but she gets upset or even mad at me when I try it, she is so sweet now that I don't have the heart to tell her that if its only friendship that she wants, I can't give it to her. Any advice on how to deal with this? Should I just go on and tell her? You think she might've changed her mind? or what?
If a girl is "nice" to you all of a sudden?
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