Girls what does it mean when a girl tells you something that she's never told anyone else?

I've been talking to this girl I met online, and we have gotten a long very well. And suddenly see told me this very deep personal thing in her life and she told me she didn't know why she told me because she has never told anyone that stuff. She also constantly says I'm a very nice person and a good listener. Why would she tell me that only after talking for a few hours?
Girls what does it mean when a girl tells you something that shes never told anyone else?
Girls what does it mean when a girl tells you something that she's never told anyone else?
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