I made a mistake that I don't know how to fix?

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we all make mistakes the important thing to do now is to be honest with her and make her listen
just tell her that nothing happened and that you made the guy stop
just keep trying text her email her mention her on twitter lol write on her facebook wall
if she really means a lot to you as a friend just take whatever she says she can't not talk to you forever how long can a person keep a grudge? if she doesn't talk to you anymore just ask her what she wants you to do i mean whats done is done right? say if you could go to the past and change what happened you would but you can't and ask her what she wants you to do i mean you will have said sorry theres not much else you can do
whatever you do don't blame the other person if you get in a conversation with her just tell her that he had part in it too
good luck