Do NOT initiate any talks about the relationship. It will not do any good and will push her further away.
I know it's hard right now and you just want to know why. But you're going to have to try to let it go. You may get to a point later where you can discuss it but for now just put a pin in it.
You need to focus on GAL (getting a life) activities and 180s.
If you love somebody, set them free. http://tinyurl.com/2empx2g