I love Divorce Remedy, but if there is an affair going on the standard tactics offered in that text don't have much success... There are many posters here who have used them here only to watch the affair grow from EA into PA while the LBS gets more depressed and ill by the day... Some including myself used DR tactics for over a year with no positive results.
There are many infidelity experts that argue taking a firm stand against infidelity in the home, managing the infidelity as an addiction produces more desirable results, SOONER than playing softball with an addict and watching your home and family torn apart.