She feels lied to and betrayed. You can't control anyone else but yourself, so there's no going back there. All you can do is apologize, be sincere, and ask what you would have to do in order to earn her trust back. Some people, you can't. I have lost many a good relationships because I either can't let something go or my trust was lost and it couldn't be earned back. She probably needs some cooling off time and needs to see that you are willing to change. Good luck!