A couple (or a dozen) points:
There are positives in his actions. Like he seems to acknowledge that the issues are his, and he seems to be reaching for tools to deal with the problems. The big issue I see however is that he seems to have a tendency to assign the root of the problems – the cause – to actions by others.
He blames social media, his work, work-environment, possible SA, you… basically everything other than himself – for his decision to cheat.
What I see sadly lacking in him is accountability.
Look – Last time I went to a strip-club I was approached by several beautiful and curvaceous young women offering me a plethora of sexually-oriented services. Yet I could stay at that club for the time I needed while turning down each and every one of the offers. This despite me 100% being able to "blame" my visit to the club on my wife! She had asked me to chaperone her alcoholic and single younger brother who frequented these clubs when visiting our city, and had a tendency to wake up in an alley without his watch and wallet. My wife knew we well enough and had enough trust in me AND I knew myself well enough to be able to enter that level of temptation – that walk in the desert – without succumbing to the forbidden fruit.
To "affair-proof" himself (and I truly think none of us can claim to be 100% "affair-proof") he needs to acknowledge his accountability from A to Z – including the crossing of the border where he DECIDED to start an affair.
He can’t blame his upbringing, the other men, lack of sex, defiance against the "system" or ANYTHING. It’s all totally 100% on him.
The Sexual Addiction issue…
Be careful here… I want to stress that I do think SA is a real issue. But…
Sex addiction is not recognized in the Diagnostic and Statistical Manual (DSM-5), the reference guide for mental illnesses published by the American Psychiatric Association (APA). It’s not officially recognized as an illness worth a specific classification.
But then… Alcoholism wasn’t either until surprisingly late (1960-70 if I recall correctly). We no longer doubt that as a real illness.
I am not suggesting he isn’t a SA, and like I started with I do think it’s a real issue. But… I fear the same reaction from people as when alcoholism and drug addiction was acknowledged as a physical and mental illness, rather than a character weakness.
If you have a tendency for blame-shifting – as your husband has – then it’s a lot easier to tell the world "I had an affair because I have an illness. Now I’m treating that illness and therefore I won’t do that again. You can’t really blame me, anymore than you would blame a person for getting cancer or some other illness" than having to say "I had an affair because of choices and decisions I took that I realize were wrong".
Plus… If he has SA he needs to get "treatment" for SA. If it’s an addiction then that’s not two pills a day for three months, or physiotherapy or anything like that. It’s a LIFELONG change in daily life, with regular (like 2-7 x a week for the first years) SA meetings, therapy, ongoing evaluation, reevaluation… For those dealing with addiction this form of treatment is very effective if adhered to. However, it’s so taxing and hard that the relapse rate is probably over 80%, with those eventually succeeding probably being in their third or fourth or fifth cycle/attempt.
However – IF his infidelity and blame-deflections are NOT due to SA then the above intense and radical treatment is about as effective as chemotherapy would be to heal the flu. It’s the wrong treatment for the wrong illness.
So be careful about the SA and using it as a catch-all, cure-all. Has to be diagnosed by a certified professional, preferably by a skeptical one.
Then the poly…
I think both of you might misunderstand the poly and it’s purpose…
It does NOT give you the truth.
It’s not a lie-detector, but more of a honesty-detector.
If your husband thinks 2 + 2 = 5, then if asked if 2 + 2 = 4 he would pass if he answered "no". It measures his honesty – not the truth.
It’s accuracy is based on two things: 100% of it’s accuracy is based on the equipment itself. If the operator you select pulls out some antiquated and home-made DIY set of wires and taped patches… It wont work.
The second factor is that the accuracy is 100% based on the OPERATOR. Notice that the total of the two factors is 200%... That’s because even with the best equipment the wrong operator will fail, and even with less-than perfect equipment the good operator will get a result. That’s why you select an operator that can refer to recent work for law-enforcement, corporates and the legal system. That should ensure both the ability of the operator and the equipment.
The operator will give you something like 3-5 questions or issues you want answered. He will probably word one of those issues into 2 questions as part of his reliability calculations.
The questions will be factual rather than emotional and answerable with yes or no.
It costs… Its not something you can do once a week while you are learning the truth. IMHO it should be used as a milestone to mark or define a certain moment in the decision of if you can R or not.
Basically – You should let your husband know that the truth is key. Anything he keeps hidden or avoids answering will eventually come to light, and that discovering NOW that the sex lasted for hours rather than the minimizing 8 minutes will cause IMMENSELY less damage than discovering maybe a year from now – when you two have been working hard at reconciling – that he purposely didn’t tell you they kissed or held hands or whatever.
You can offer him a safe environment to tell you the truth. Like you can tell him that for the next 4 weeks you commit to reconciling no matter what he tells you. That your instant reaction will not be to kick him out and file. That he shares the truth at the next MC session or can write it down or that he answers questions you write down or whatever. The method is not key, the truth is.
At the end of that amnesty-period you will probably be demanding a poly. He can decide now if he wants to build the future relationship on accountability and honesty, or if he wants to lie and spend the next weeks on googling "how to beat a poly".
At the end of that period – when he tells you that you have the truth – you might give him 10 questions and let him know that the poly will be based on those questions. Then make it very clear that the goal of the poly is for you to start believing he’s being honest. It’s a tool for HIM to regain trust. Then make it clear that IF he passes the poly then it’s up to you to acknowledge that he has earned some trust. It’s not the old trust, but a trust-but-verify form of trust. But make it equally clear that if he fails… then that is a clear indicator that he doesn’t trust YOU, and that his failure would force you to reevaluate any possibility to reconcile.
Then be prepared for either result… The money spent for the poly would be better spent on a good divorce lawyer if you don’t intent to act on the result or hope to go on without a sense of having the truth.