About breaking up, I feel you there. A lot. I have yet to figure out what my current love wants to do, since it kind of...makes no sense. Don't feel like explaining, but anyway I can definitely relate to the not-caring-in-the-same-way thing. This is really generic advice, but give it some time. I've had about 5 months to think about my feelings and stuff, and at this point I think I'll be okay. Hurts, but it'll be okay.
I'm glad you met someone! It's unfortunate she's in a relationship, though. Doesn't that always seem to happen? >.> Anyways, hopefully things work out between you two (if you want it to, or you could just stay friends, like you said) and hopefully your feelings get more coordinated. I hate when I feel so undecided, too.