Please! Why would you want someone in your life that has demoted you from lover to "just friend." She'll suck you dry and keep you tied up mentally and emotionally so that you'll lose out on girls that actually want you as "best friend and lover" in an actual reciprocal and committed relationship. No new girl will understand your obsession with your female friend if you're foolish enough to try and keep her as a "friend."
Stop the desperate, codependent thinking and stop being afraid to be without her. Go zero contact and soon enough you'll have the right frame of mind to realize that you don't need her in your life and you'll not want her to keep you in her emotional clutches. How the hell are you going to feel when she has a new boyfriend and all of a sudden she doesn't have time for you?