The Just Friends Zone
You want to be more, but are you too nice?
What does a woman mean when she says you are too nice?
Maybe this is a problem that has everything to do with her and nothing to do with you. In her head she is going over her past relationships and she is considering how her and her ex's felt afterwards. She knows that the last relationship hurt her and the guy both, she wants to spare you of that pain because she really does care about you.
This also preserves the relationship that you have now, in her head that is, as she believes that this way the friendship is safe. Although she doesn't realize how much the phrase that she just uttered hurt you, and now there will always be that sore over your heart.
A little advice be persistent and do not check out or talk about other females of possible "interest" to the female that you wanted to be with. Chances are she has the same feelings for you but she is too scared to chance the friendship. Give her time but just remember that once you cross that line there is no way to stay friends afterwards and respect the other persons future partners.