You have one major advantage and that is time.
I would strongly suggest you use that time and put the poly on hold for a minimum of 30 days.
Unlike many of us you aren’t dealing with an active affair, but something from the past. Doesn’t diminish your pain, the necessity of healing or the fact YOUR d-day is recent. But it does offer you the ability of dealing with this in a more calm, controlled manner than most of us can. Most of us are dealing with raging fires and have yet to deal with the debris and damage. It sounds like you can go directly to dealing with the damage.
I somehow get a sense that you are rushing to the poly as if the poly is the solution to all.
Well… What are you going to do if she fails? What if she confesses NOW to a dozen affairs? How much leeway are you willing to give her for the truth?
What would divorce mean? What does reconciliation mean?
What is your next step IF she fails? What is your next step if she passes?
I seriously suggest you look into all these aspects and have a clearer path laid out for after the truth and/or the polygraph. Time will allow you to vision that path and to put in place plans so you are more likely to stick to your path.
We had a poster here (still contributes on and off…) a couple of years ago. His wife insisted the affair was non-sexual, despite texts and e-mails describing sexual acts, finding sex-toys, lingerie and nights spent with OM in hotel-rooms. I tend to be reluctant to jump to assumptions, but I don’t think a single poster contributing to his thread doubted she and OM had sex.
He eventually had his WW take a poly and she failed miserably. The operator graded the answers as accurate beyond reasonable doubt. Despite that failure his wife still insists it was non-sexual and IMHO he is still trying to reconcile from something he doesn’t know or understand. He and his wife are trying to learn how to live with a great big smelly pink elephant in their house.
I am of the opinion that a marriage can survive anything. If both BS and WS want to reconcile and commit to it then a marriage can survive anything. Anything other than lies. The truth is the very base reconciliation is built on and any deviation from the truth is doomed to wreck reconciliation.
I have no doubt the poster could reconcile his marriage knowing that his wife and OM had sex. But I am equally certain that there will be no real reconciliation in that marriage while the BH THINKS his wife had sex with OM, but never has the certainty of KNOWING.
This is why I say a poly needs to be a watershed moment.
You have to believe the result and act accordingly. If she fails it needs to have negative impact on your ability to reconcile. At the same time – if she passes then she needs to be credited with some trust.
The poly can not be used as a bi-weekly test until she passes.
This is what I would suggest:
First of all make it very clear to her that the truth is the single most important factor.
It’s so important that whatever truth she shares NOW will be appreciated and will not be met with the anger it should deserve, but that while there is truth there is hope.
Make it clear that if she isn’t truthful it shows she doesn’t trust you, and without that trust there really isn’t a future for you two as a couple.
Let her know that if she passes a poly then you will do your best to work at reestablishing trust and work towards reconciling. Be clear it’s work, and that there are no guarantees but that if you believe she is telling the truth and therefore trusts you it will be willing to give your best effort to reconciliation.
Make it equally clear that failing would diminish both any wish and any hope you have of reconciling. Divorce would be tough, but realizing that after 40 years of marriage your wife doesn’t know you and trust you well enough with the truth would be worse.
Go look up divorce in your state. I’m fairly certain that with +40 years marriage its plain old 50/50. Frankly that’s just fair. Don’t fall into the “she’s taking everything” or the “men get screwed in D” trap. Be realistic about what D would look like. Remember it’s detachment so it’s not like she will move into the shed at the bottom of your garden and still cook your meals.
Visualize divorce. Imagine yourself 2-5-10 years from now without your wife.
Consult an attorney. What would the timeframe of D be?
If she fails: Do you move out? Is it instantaneous divorce? Is failure on one question of 5 enough? Does it matter what question it is? Maybe as an initial step: When she leaves for the poly ask her to pack a bag for and that if she fails she needs to be somewhere else for 3-5 days while you contemplate your next steps.
If she passes: What are your next steps? What are you two going to do? MC? IC?
Have all these things as clear as possible.
Have a plan in place. Have one you have thought through and believe is enforceable. It’s OK to change your plans according to what happens, but it would be immensely better for you to give yourself time to prepare and think things through.
Your WW has been carrying this secret in your marriage for 40 years. It’s in the open now, and waiting for a couple of weeks won’t make it any better or any worse, but it can definitely help YOU make the correct decisions.