A good article on the importance of no contact by Dr Harley:
Never see or communicate with a former lover
Once an affair is first revealed, whether it's discovered or admitted, the victimized spouse is usually in a state of shock. The first reaction is usually panic, but it's quickly followed by anger. Divorce and sometimes even murder are contemplated. But after some time passes (usually about three weeks), most couples decide that they will try to pull together and save their marriage.
The one having an affair is in no position to bargain, but he or she usually tries anyway. The bargaining effort usually boils down to somehow keeping the lover in the loop. You'd think that the unfaithful spouse would be so aware of his or her weaknesses, and so aware of the pain inflicted, that every effort would be made to avoid further contact with the lover as an act of thoughtfulness to the stunned spouse. But instead, the unfaithful spouse argues that the relationship was "only sexual" or was "emotional but not sexual" or some other peculiar description to prove that continued contact with the lover would be okay.
Most victimized spouses intuitively understand that all contact with a lover must end for life.
Permanent separation not only helps prevent a renewal of the affair, but it is also a crucial gesture of consideration to someone who has been through hell. What victimized spouse would ever want to know that his or her spouse is seeing or communicating with a former lover at work or in some other activity?
In spite of career sacrifices, friendships, and issues relating to children's schooling, I am adamant in recommending that there be no contact with a former lover for life. For many, that means a move to another state. But to do otherwise fails to recognize the nature of addiction and its cure.article in its entirety:
http://www.marriagebuilders.com/graphic/mbi5060_qa.html