I agree with everyone else. Here's some more food for thought-remember that whatever you've done to someone comes back to you threefold. And there's the cosmic law of whatever you do comes back to you. This even includes thoughts believe it or not. To quote another poster's quote "He who angers you controls you." And that is VERY true. If you seek revenge, you just give more power to the person that hurt you&I'm sure you definitely don't want that. I know it's not fair, but what goes around does come around.

Hope you get over your feelings of anger and betrayal, unfortunately there are always people willing to hurt you for who knows what reason.