wow, sounds like you really don't know what to do. first and foremore, you're going to have to end your current relationship if you want any chance with this girl. she doesn't want to get involved with you if you still have a gf, or she doesn'e want to feel that if she rejects you, you will have a back up plan.
besides that, i think you should tell her how you feel reguardless if she seems to be fading away. who knows, you might actually bring her closer to you by expressing how you feel. raverboy
...this is just my perspective on the situation...