Mark,
Welcome to Marriage Builders, sorry you are here.
First off, you are right, the only reason a spouse wants to move out is so they can resume the affair unimpeded. But, you can't force her to stay, you can only tell her that you don't agree that it will help your marriage and don't don't want her to move. [one can't work on their marriage if they aren't there!]
Secondly, it is imperative that you call the OM's wife NOW and tell her all this. Often exposure blows the top right off the affair. You should be exposing this affair to all key people now. An affair cannot survive without secrecy. Often, just exposing the affair will bring it to an end.
Next, I would start on Plan A. Plan A means that you try to meet the needs that the OM is meeting and attract her back into the marriage. It also means NO angry outbursts, disrespectful judgments and demands. These are called lovebusters and every time you lovebust your W, you make the OM look more attractive and give her ammunition to justify her affair.
I would get ahold of Surviving an Affair by Willard Harley. You can order it on this website and they have fast, cheap shipping. But in the meantime, here is some information below about Plan A.
So, I would do 2 things today, call the OM's wife and tell her and start Plan A. AND get the book SAA.
http://www.marriagebuilders.com/graphic/mbi8113_ab.html Plan A overview from Marriage Builders coach, Penny Tupy:
Plan A is not (repeat NOT) about making the WS happy, or feeling good.
Plan A is NOT, contrary to popular (and very incorrect opinion), about "making yourself a better person," or "working on yourself."
Plan A is ALL ABOUT the straying spouse. In Willard Harely's ever brilliant words, Plan A is a stategy to end the affair and to entice the straying spouse to reconsider the marriage.
So, it has several elements that should be done at the same time.
First is to eliminate LBers and to meet needs as best you can... recognizing that the unfaithful mate may not allow the betrayed partner to meet needs.
Second is to CONFRONT the unfaithful partner with what you know. Doing so (of course) in a way that is respectful and about you... how you feel, how you are affected by the affair.
Third is to expose the affair to the scrutiny of the world. The lover's spouse or s/o, coworkers, family, friends, church family, children, etc.
ALL OF THAT is Plan A. And it should be done as much as possible simultaneously. (If you don't believe me call the radio show Mondays and Thursdays at 1pm Central Time and ask Dr. Harley for yourself.)
Plan A must have a deadline. It's called Plan "A" because there is a second step... aptly named Plan "B." Willard Harley suggests a max of 6 months for men and 3 months for women before going to the next step. If Plan A hasn't worked in that time, it's not going to.
(I challenge you to find anyone who has done Plan A longer than that and been successful. I define successful as the A ending, n/c promised and verified, and the couple working a good recovery plan which includes meeting needs, eliminating LBers, getting in 15 hours a week of UAT, and most importantly following POJA.)
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<small>[ July 06, 2004, 07:32 AM: Message edited by: MelodyLane ]</small>