divamom,
You need to get at the truth somehow or it will drive you bonkers and keep you from developing a level of intimacy that is needed to sustain a marriage. It will also probably happen again unless the truth comes out and the reasons behind the affair are confronted and handled.
I doubt that you will get much out of the OW, though. She won't be eager to implicate herself and will probably try to contact him after your call.
That leaves you with him. I wonder what he would think if he read this from Marriagebuilders:
"From my perspective, honesty is part of the solution to infidelity, and so I'll take honesty for whatever reason, even if it's to relieve a feeling of guilt and depression. The revelation of an affair is very hard on an unsuspecting spouse, of course, but at the same time, it's the first step toward marital reconciliation.
Most unfaithful spouses know that their affair is one of the most heartless acts they could ever inflict on their spouse. So one of their reasons to be dishonest is to protect their spouse from emotional pain. "Why add insult to injury," they reason. "What I did was wrong, but why put my spouse through needless pain by revealing this thoughtless act?" As is the case with bank robbers and murderers, unfaithful spouses don't think they will ever be discovered, and so they don't expect their unfaithfulness to hurt their spouse.
But I am one of the very few that advocate the revelation of affairs at all costs, even when the wayward spouse has no feelings of guilt or depression to overcome. I believe that honesty is so essential to the success of marriage, that hiding past infidelity makes a marriage dishonest, preventing emotional closeness and intimacy.
It isn't honesty that causes the pain, it's the affair. Honesty is simply revealing truth to the victim. Those who advocate dishonesty regarding infidelity assume that the truth will cause such irreparable harm, that it's in the best interest of a victimized spouse to go through life with the illusion of fidelity.
It's patronizing to think that a spouse cannot bear to hear the truth. Anyone who assumes that their spouse cannot handle truth is being incredibly disrespectful, manipulative and in the final analysis, dangerous. How little you must think of your spouse when you try to protect him or her from the truth.
It's not only patronizing, but it's also false to assume that your spouse cannot bear to hear the truth. Illusions do not make us happy, they cause us to wander through life, bumping into barriers that are invisible to us because of the illusion that is created. Truth, on the other hand, reveals those barriers, and sheds light on them so that we can see well enough to overcome them. The unsuspecting spouse of an unfaithful husband or wife wonders why their marriage is not more fulfilling and more intimate. Knowledge of an affair would make it clear why all efforts have failed.
After revealing an affair, your spouse will no longer trust you. But lack of trust does not ruin a marriage, it's the lack of care and protection that ruins marriages. Your spouse should not trust you, and the sooner your spouse realizes it, the better.
The Policy of Radical Honesty is one of two rules you must follow to protect your spouse from your self-centered behavior, which includes affairs. The other rule is the Policy of Joint Agreement (never do anything without an enthusiastic agreement between you and your spouse). If you were to be completely honest with you spouse, and you were to follow the Policy of Joint Agreement, an affair would be impossible, unless for some reason your spouse wanted you to have one.
If you knew that your affair would be discovered -- that right after having sex with your co-worker, your spouse were to find out about it -- you would probably not go through with it. And if you were honest enough with your spouse so that YOU would be the one to tell him or her what you did, your honesty would be a huge reason to avoid any affair.
How the victimized spouse should respond to the revelation of an affair is a subject of a later column. I do not have the space to treat it here. But a spouse is twice victimized when he or she is lied to about an affair. Truth is far easier to handle than lies. "
http://www.marriagebuilders.com/graphic/mbi5060_qa.html