Ken, there's a GREAT BOOK out called Not Just Friends by Glass.
She explains this far better than I can.
But the main point is... once your wife's infatuation is built up, they can't be friends anymore.. you can't go back from that.
MOST of the people on this forum had the naieve trust in their spouse and in the capacity for integrity between two people that you do right now...
We grew up and got real very fast once we learned anther man has been secretly mounting our wife because we chose to do nothing other than believe in the good of human nature.
Infidelity is VERY ADDICTIVE.
If you think you can take a bottle away from an alcoholic, or a needle away from a drug user, or money away from a gambler, and they will simply stop, you are a fool.
You will be here in three months time again. This OM will be having sex with your wife, and your marriage will be in much more jeapoardy than it is right now.
Take time off from work, and find some leverage to get OM to leave your wife alone. Do NOT try to control your wife.. that will just antagonize her twoards you and push her into his arms quicker than OM is already drawing her in.
If you have to take six months off of work and follow that creep around the city 24 x 7 to keep him clear of your wife you do it.
Don't be a fool. We have ALL heard this story on this forum and it does NOT end well I promise you. Find some leverage and USE IT before its too late.