I hate mixed signals!!?

So there is a girl that ive been lately getting to know, shes really giving me mixed signals. As i barely ever see her at school we talk on facebook and sometimes text. So when we talk on facebook we always talk for more than 2 hours straight and she replies in a snap. I feel as if we have a strong connection. I called myself a jackass and she says i dont know you that well but I dont think you are I think of you as neutral. And I asked her to text me before and she said i dont text unless its important. And she never pokes me back on facebook because she doesnt poke. BUT when we talk we talk for hours. How can i get her to confide in me because i really think that that is what starts off most relationships. How can i show her that im not like the other guys from being a neutral to a great guy u know?