I can't get over a woman who has a boyfriend because she treats me like she's into me...what do I do? Wait?

I say since she's in a realtionship you be in one too. If your supposed to be ok with her being with another guy then she should be able to handle you being with another girl. Even if you find another girl and you don't like her as much as this one, don't limit yourself to waiting around for a girl with a boyfriend. If she gets mad about you talking to other girls then she should obviously be with you...