if you can, stay friends, although this is very hard to do when you still have feelings for each other.
What happens when she finds someone her parents do approve of? how will you feel then?
You can't just hang around in case she changes her mind.
I know you must be relly hurting at the moment - been there (spent 2 weeks in my flat crying ) it seems like you'll never get over it but you do.
Hopefully she will change her mind in a week or two but if not don't wait around, enjoy your life and make the most of it, lifes too short and there are too many people out there to meet.
Not sure if this helps you. I hope itdoes a little,