Mate, I can relate and if I was in your position it would be really hard to walk away, but from experience a head fukk is a heads fukk and if she is doing this now imagine what it would be like if you got into a relationship and you never knew where you stand etc - would be a nightmare. If it was me I would probably do everything in my power to bang her and see if she's worth the hassle - problem there is she may be fukk of the century and then you're even more screwed

Walk away mate