I am sooo sorry for your lose and the betrayal you have just endured.
I have no words or wisdom for you. I am sure someone will be able to give you some comfort.
Have you spoke to your husband, told him how you feel about what happened. I would, if I were in this situation, want to know what in gods name was going through his and your gf head. That was just a really stupid thing to do.
Your friend,
Prettylady