Bipolar, attracted by money, always wanting to change you into something else while claiming they love you for what you are, clingy, emotionnal, touchy, jealous, asking for fresh air then for more romance, uninterested in sex but craving for babies, etc.
I thought it was a normal pattern for a girl... Someone lied to me?
On the serious side, beware of that kind of letter. It's always one-sided, and the whole story would be quite different with others' point of view.
Don't think I've dated crazies, but a girl trying to give me what she thinks is what I want (sex, fidelity, presence) isn't what I call craziness. More misleaded proof of love. Talk about it with her first. Then decide what to do. Everyone is more clumsy than we think they are, especially in expressing their feelings.
On the guy side, it's more simple: eat, sleep, sex (and videogames of course). Anything outside this pattern is suspect. 8)