Infidelity Support Group
Any relationship in which one partner engages willfully in sexual relations with another outside of the partnership is considered to have experienced infidelity. This breach of trust is often traumatizing for the faithful partner as well as the relationship, and support is often needed to heal emotionally and to decide whether or not the relationship should continue after...
Reading my own thoughts
For fixing what was wrong that lead to the affair, you might try "Getting the Love You Want" by Harville Hendrix. It will teach you how to communicate. Also, you might take a look at www.LightYourFire.com by Dr. Ellen Kreidman. Her CD series is the bible on how to behave in a relationship.
Has your neighbor moved away? Good luck on recovery.