I think that you misinterpreted Aussies advice in that he was telling you not to waste your time. The best advice that you can get is to be forwarded to the link for the DJ bible
http://www.jbspencer.com/djb/
Drop this girl and spend your time learning. To be relevant for your situation I will ask you this simple question. Why should she drop her current boyfriend to date you just because you think that she would be better off (btw not realistic) and what would make you think that some other guy wouldn't come along and ask them same thing well you were dating her?
I have spent the better part of my dating career surrounded by friends who will try to act like I am the ******* when it comes to women since I am upfront and honest about what I want. When I meet a girl and tell her before we even have a date that I am not interested and then end up sleeping with her I get my clueless guy friends trying to make me feel guilty about it. At the same time they are to shy to actually admit to a girl (or themselves) what they are looking for and wind up getting pushed aside. You seem like one of the guys that puts up fake barriers to deny rejection and needs to face the facts and address your own issues.
As much as you want to think that you are better for her than her current bf you probably would be much worse since you would pander to her every whim and be too scared to defend yourself.