Apom, I also found out (for sure) years later. I am morbidly amazed at the similarities of the nightmare expressed here by different people.
I am 63 and married almost 38 years. I took early retirement at age 55 just as our life plan and dreams were laid out. We had established a cow herd and were going to retire from salaried positions and be ranchers.
In December, 2002 I knew something was terribly wrong. I confronted then and many times since because the explanations didn't make sense. Gaslighting, blameshifting. Never a confession. The adultery was with a COW who was married and when he and my WW were getting started his wife and he were still living together. His wife left him in the fall of 2002 because she found evidence of him committing adultery with a different woman. All of the contact between them was through work avenues to which I had no access. He was caught by his BW on the other adultery by cell phone records so my WW told him to never call her and he didn't very much.
My WW had advanced quite rapidly and was in charge of a very major project that was stressful. She managed her staff (he was one of them) very well and carried out an extremely successful campaign. I was so proud of her and she fucked her AP in hotels all over the province while they were travelling together.
The adultery lasted about 4 years. She went on anxiety medication in the fall of 2003 which I thought was because of the major project. It was but, IMO, also because she was very active in adultery. The meds allowed her to continue in adultery with little stress. They were in contact from time to time since 2006 (the 4 years). She says there was nothing physical since then.
I finally put together all of my circumstantial evidence, gave it to her and she confessed on Sept. 1, 2013. The lies by fact and omission lasted all of that time. I was pretty sure there had been adultery but we were pretty good together so I was probably wrong. But my gut said there was something terribly wrong.
Like your story,apom, there is much more to mine. I just wanted to relate this to you so you know you are not the only one. Others hare have posted their circumstances and too many of them are so similar.
When my WW confessed I was sure that there had been adultery and I just needed the confirmation because there was something missing, something special, in our marriage. I was totally unprepared for the effect it had on me. Initially I felt releif - I wasn't paranoid, I wasn't hyper-jealous, I wasn't over reacting, I wasn't demented, etc., etc. That lasted only a few minutes until reality hit me. I attempted suicide the next day. I had suicidal thoughts for some time. I was not eating (couldn't swallow solids), not sleeping (on the internet throughout the night grasping at anything). Not functioning. I don't remember hadly anything - just little chunks here and there.
You are 6 months past DDay. That 6 months, for me, was horrendous. Why didn't I do more, why didn't I trust my instincts, why didn't I hire a PI, why didn't I, why didn't I, why didn't I....? In that 6 months 3 more DDays, tons of TT, gaslighting, blameshifting, minimizing.
I need to know details. I am a detail person. I am very analytical (while a valuable characteristic in my professional life probably a detriment here). I don't get details. A lot of IDK, ICR. And little or no effort to fill in the massive gaps. No timeline yet.
My WW took a polygraph. She passed with "flying colours" on the 4 questions I had. See Craig2001 for more info on polygraphs and elsewhere on SI.
I just wanted to warn you that it gets worse. After the numbness and anguish in the first 6 months comes anger. I had rage during the first 6 months followed by curled up in a fetal position wretching, sobbing anguish. The anger is different. It is coming. The adultery was a long time ago. The lies continued though and, as said above, it was yesterday for you. Until you get remorse and true reconciliation beginning be prepared for many "start overs".
Your dillema and mine and others who have posted here is what do we do at our age. When I was 52 I had a lot of options. I have few now. I are pretty set financially together but not apart. I carried on making our dreams and goals happen and she fucked her NSA FWB. I loved her so deeply and feel like I have been used for 38 years. I do believe she loves me as much as she is capable of loving anyone. I don't have any other dreams or goals in life and I can't imagine starting over now. But the status quo is not an option either. Trying to pick the best choice out of two very lousy options.
Sorry I am so long winded, apom. I am always apologyzing for that. You are not alone (I was somewhat relieved when I found out I wasn't). It is a shitty situation for which you are not to blame. The adultery is entirely on your WW as it is on mine. If she truly loves you and is interested in your health she will do what she needs to do for you.
I am sorry for your need to be here. You will find, I am sure, that given your circumstances it is the place you needed to find. I wish I had found it in 2002 instead of the internet sites that provided such wrong and hurtful advice that I took.
God be with you and all of us as we try to navigate through this.