I would definitely recommend Love Must be Tough by James Dobson. It's a very good book and a lifesaver for me along with DR. It talks about the importance of respect and just the right approach to being loving but tough - holding someone accountable for their actions. It is especially good on the issues of infidelity.
I wish I could offer some helpful advice in terms of specifics, but I'm not sure I'm good enough at this advice business to do that yet.
