It sounds like the girl was pretty fucked up herself. Lots of people don't REALLY want a relationship to work or to be happy, even if they say they do.

I think you have already started to listen to yourself and be honest with what you actually want in a relationship. The hardest part sometimes is realizing that it is okay to want things for yourself as well as your partner.

By being honest with yourself about what you want, and being honest with your partner about the same, it is much easier to communicate and find out how much you should invest and and how you see any future developing. :)