Girl is shutting herself off?

I am 'talking' to this girl, who is amazing. She is fantastic, sweet, and pretty. I really like her a lot. All the signs that she should like me are there. The problem is that she says she does not like me back. Her explanation for this was that her last boyfriend hurt her really bad and that she is afraid to try again for fear that she will get hurt again. Which, for the record, I would never do. She also said that she is setting up all these 'walls' to prevent herself from getting hurt. So, my question is what can I do to break these 'walls'? Thanks, a lot! (:
Girl is shutting herself off?
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