young girls and guys for that matter are fickle! they can have really intense feelings for someone, and feelings can change quickly. I agree with five keets...do not pursue her unless she and her current boyfriend break up. If you would stop flirting with her, she may feel she is loosing your affection and this may expedite things if she really does care for you. Girls like a challenge, and if you are that easy to get, it may not be all that exciting for her. If she thinks she has lost her chance with you, but she really likes you, she might dump the other guy and you won't be the bad guy here.