PPL, we missed you. Very simply put, you did not make a lifelong commitment to your "friends." You made one to your husband. The hell with them.
My brother and I recently got into it for the exact same reason. he thought I was being a p***y. I was willing to give up my brother for the sake of my cheating wife because that was the commitment I had made. (Fortunately, that did not happen.)
Hold your head up high. What you did in fighting for your marriage took more guts and determination than anyone else who would simply give up. Besides, you know as well as everyone here, you never know what your reaction will be until it happens to you.