Why won't she open up with me?

It's torture she's so emotionally detached. I have know n her a year but it's like I just new her a day. She hides all of her feeling and opinions and when we hangout she doesn't say barely anything. I ask her to just talk say whatever I will be OK with it and she doesn't seem to change. She only likes light topics that mean nothing. She won't ever let me inside. I told her that I can't keep being in limbo with her when she won't opening up. then she says you never were anything to me , and don't talk to me again. It was a whole year and it was just like you meting someone new. We got along and we're really cool but what did I do? Why couldn't she just be real I gave her everything I got.
Why won't she open up with me?
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