When you see her, be kind, caring and considerate.. Don't turn yourself away from her, listen to what she has to say.. You be honest but sensitive, though its hard, honestly salvage any possible future friendship
I always look at it like taking off a band aid, Would you rather do it fast or slow? Well, which one hurts more?..... Exactly, Get it over and done with, No one likes to get dumped but at least appreciate the truth when its over. (Don't mention if you've met someone either, If you have that is) That will hurt her.. Don't react if for whatever reason she gets mad!

Stay calm..
Let me know what happens...
Just a few things I've learned..