Jeeze, man up mate and make a decision. Do you want to be with this girl, or do you want to be her friend? Try for both and 95% of the time you'll end up with neither.
Faint heart never won fair lady. I'm not saying steal her from her boyfriend but if you're interested, tell her up front that's what you're after. She'll go away knowing where you stand and thinking about it. You may not ever become best friends forever but I guarantee you'll have more of a shot with her if/when she becomes single than if you hang around and become part of the furniture in the interim.
Faint heart never won fair lady. I'm not saying steal her from her boyfriend but if you're interested, tell her up front that's what you're after. She'll go away knowing where you stand and thinking about it. You may not ever become best friends forever but I guarantee you'll have more of a shot with her if/when she becomes single than if you hang around and become part of the furniture in the interim.