I don't think it is the place of anyone on this site to tell someone their marriage is over. You don't know this. Yes, his wife is mad at him, but about deception rather than cross-dressing. Being mad at a partner happens in most relationships and most people get over it. If you feel that intervention is justified, then be constructive, not judgemental. I have had someone interfere in one of my relationships and I have never forgiven the interferer. I don't blame the interferer for what happened next - my partner made her own decisions (nothing to do with the cross-dressing, which she knew about) but interference in other relationships is wrong, with the exception of a relationship that is abusive.
