Nancy,
I agree with Karen to look at why it happened. Then don't betray yourself by being too critical! Be your own best friend. You'd forgive her if she did what you did, right? You deserve your own compassion and understanding. You have ours, too.

Let it go and put it behind you as a learning experience. In the words of Tracy Chapman (I'm a fan, too!) "We can resolve to start all over make a new beginning...."
Hang tough,