david,

Most people will continue to stack evidence until it is totally conclusive. Does this OM have a wife or a girlfriend? Do you have phone logs, hotel reciepts, voice recordings, emails?

Your going to build up a stack of info. So far the greatest way to get the spouse to come home is bursting the affair. That means breaking up the relationship. Usually if the OM has a wife or GF, getting enough conclusive information together and showing her gets the job done.