Most Helpful Girl
I couldn't remain friends with an ex if I still had romantic feelings for him. It'd be too painful. Eventually she'll meet someone new and watching someone you love... loving someone else would be far too painful to do.
You have to be able to supress your feelings, and be an emotionally strong person to stay friends with someone you still love. I think you need to ask yourself which is more painful... remaining friends with her , knowing a friendship is all you'll ever have with her, or cutting all ties with her, and not having her in your life. Whichever is the least painful for you.. choose that