S.O.S!!!!!

My girlfriend confuses the hell out of me!!! We have been going out for more than a month now but sometimes I feel like Im with a total stranger.At first(before we were a couple) we used to talk about everything but ever since she told me that she was falling for me and I admitted that I felt the same, we dont seem to have much more to talk about. She used to call me but these days I do all the calling. When I send messages to here phone she wont reply. When I ask here what is wrong she wont tell me…even if I persist in asking her. The other thing that bothers me is when we kiss. She kisses me for a few seconds and then pulls away, even our first kiss was like this even though she initiated it. But one thing that kinda got me worried is the way shes always complaining about the way she looks even though she always likes telling me about all the guys that wanted to date her. Sometimes she doesnt like me looking at her because she says shes shy. Im crazy about her but I dont think she believes me. A couple of days ago I told her that I loved her and she as usual did not show emotion. Yesterday out of the blue she said that she did not love me she cared about me but was thinking of breaking up with me.If anyone is reading this please help me out because I don`t know what do do.