Suited, as a Christian, I believe that good people can fall into sin. I knew my W for 6 years before the affair (married for 5), so the A does not completely define her in my mind. I believe in forgiveness and the power of God's love to change people ... and I've seen it firsthand.
Sure, I deserve better than what my W has done. She also deserved a better husband than what I was for 5 years. What do you think my 5-year-old daughter deserves?
Cunningham has some good points about generating attraction, but his view of relationships comes from a different perspective than mine. For Cunningham (and for most people), relationships are about making yourself happy and fulfilling your desires. While meaning no disrespect to anyone else, I want to make God happy and live out His will for my life, and I believe that He will bless me for doing that.