You may want to check out Dr. Dobson's book "Love Must Be Tough". It's along the same lines as DB/DR and it's geared towards spouses dealing with affairs.
Btw - that ring on your finger is not just a covenant between you and your H, it's between you and God too. Even though your H may not be taking it seriously right now, I guarantee God is and will provide you comfort when you look to him for it. :-)
FunDad
Me:40 W:39 M:Dec 95 Split: Jul 14 W Filed: 9/16/14 Several Children (including adopted)