Just don't let her use you. I don't mean to be a misogynist, but sometimes women can use guys as support crutches. It's such a tired, oft-repeated story--guy likes girl, becomes close friend; girl uses guy for support and goes for the tough asshole. I'm sick of hearing this story.

Do both of yourselves a favor, and stay away from the whole mess. Like >>3 said, go out more. I'm not saying you shouldn't support her at all, just don't let yourself get drawn in or obsessed because you'll only get hurt more.