Betrayal and forgiveness are the message behind a very beautiful song Broken Vow by Lara Fabian. This is one of my favorite song. She wrote it by herself, and she could deliver the song in a very good way.
"I let you go, I let you fly". Yes, we could not hold someone whose heart is not meant for us any longer. So, what's best we can do is to let him/her go. Though it's not easy to admit the fact that he/she has betrayed us, but that would be the best.
Giving a chance for other to get their happiness would lead us to get our real happiness in life. A good woman deserves to be loved by a good man. vice versa.