If she does not have faith in you and cannot trust you - it's over. There is nothing you can say or do that will change her feelings and to have a relationship it requires something from BOTH of you. Let her go.
Somewhere out there is someone who is deserving of all the wonderful things you have to offer - - keep your chin up, spend some time getting over this mess, and you may find that when you aren't looking you'll find what you need.
I think the mistake a lot of us make is thinking the state-appointed shrink is our friend. - Jack Handy