I agree with LMS and Joker in what they're saying that this girl is a bit ****ed up. If she was a ***** then chances are she wouldn't tell you, I think it's much more likely that it was a test looking to push you away.
She probably wants to see herself as a ***** to protect herself from getting hurt and she's giving you a warning in advance to allow herself to act this way in future.
However underneath there is probably someone very fragile and looking to be protected.
I understand why alot of people here would next someone like that but sometimes these relationships are what makes life worth living, it's a challlenge and the reward can be great too - just don't get in deep unless she does open up and even then always be on the lookout as she will periodically drop back to past behaviour.