DDay in June. Discovered texts and pictures, confronted WW, and found out about on and off affair going on for 5 1/2 years.
Things have been going good since
There is really no way for us to give you any meaningful advice when this is the entirety of what we know about your situation. It's difficult to recover from a LTA.
-The sense of alternate reality. What has your marriage really been about for the past 6 years? Who are you to her besides an income and a helpmate with the kids?
-The feeling of being the sexual Plan B for so many years, knowing she was sneaking around for illicit sex with another man instead of you. Imagine all of the time, energy, and creativity she invested into creating secret sex opportunities with the POSOM.
-The fact that lying to you has become her normal, for so many years and to such a degree, that you can never really be sure whether she is now telling you the truth. If you had not discovered the A, it would still be going on. Do not accept any bullshit from her about "I was in the process of ending it." Right now, she is a cornered animal. You absolutely cannot trust any utterance that comes from her mouth.
Most people, about 5 months after DDay of an A of this magnitude, would still be feeling gobsmacked, still reeling from the magnitude of the betrayal, still wondering which way is up. Thus, your statement "things have been going good since" defies what we collectively know about infidelity. There doesn't seem to be any way things could be "going good" at this point, unless (a) you are rugsweeping, to a giant degree, or (b) there are some very unique details we don't know about that make your A special and diametrically different from every other A discussed on this forum.
I think (b) is unlikely. Details are important and do matter, but posters come on SI all the time feeling like their marital love is special and holy and they can spring back from infidelity in minutes, in contrast to the hundreds of hand-wringing flagellants on SI who agonize for years after DDay. Invariably, posters like that come back later, tail twixt legs, acknowledging we were right, the WW is nothing special, just a cheating, lying bitch who doesn't deserve your time of day.
My money is on (a). I would warn you about this. If you don't address the details of her A and, if she is not absolutely begging you for R at this point and trying to win you back with every ounce of her soul (and driving by the POSOM's house ain't that), you will find yourself years from now seriously regretting the wasted time invested staying with her.
Among other things:
Inform the BOW now. It's the decent, human thing to do, and she may be an ally who can give you good information about the A.
No sex until both of you are tested for STD's.
Consider having your kids DNA tested.
Do NOT see an MC at this point. She is a broken person. MC cannot work with a broken spouse. She needs to fix herself first.
Go to The Healing Library (yellow box, top left of page) and read there. In particular, read about The 180, and put it into practice in your life. This is to give you space to clear your head and figure out your own personal truth. It is not to punish her.
Finally, I would suggest you read and print Joseph's Letter (in The Healing Library) and give it to her to read. Also, the book, "How to Help Your Spouse Heal from Your Affair" by Linda MacDonald.
[This message edited by Butforthegrace at 7:22 AM, November 30th (Friday)]