What to do if a girl likes you and u dont know if u like her

I'm friends with a girl and we are in the same year in school. We are friend and over the last few weeks she has been messaging me on facebook . One say she told me that she likes me. Today she left an x at the end of her messages and I don't know what to do. I'm not sure if I like her as more than a friend or not. She's very nice and has a great personality but I'm still not sure. I need help please and fast.
Asked Jul 12, 2014

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