Hi AmbivalentOne. So sorry you find yourself here but you have come to the right place. Welcome to 60K of your new best friends and the best club that no one ever wants to join.
Deep breath OA. I'm going to hit you with a lot of information. I try to give as much up front as possible so that you can refer back to it later if you need to.
First the basics. Don't confront just yet. What do you know about her AP (affair partner)? Is he married? Contact info for the OBS (othe betrayed spouse)? etc. In my opinion, if you can, you need to let the OBS know what is going on before you confront your WW (wayward wife). By letting the OBS know right away you take away a card that some WWs try and hold over their BHs. "If you tell their spouse I'm divorcing you, never talking to you again, etc." You get the point. You take that option off the board. First off, this is not a revenge play by any means. It's common courtesy to let the OBS know what is going on in their relationshit. They have a right to know just as you do. Plus the OBS can often help you in some areas such as sharing info and keeping an eye on the AP. If you can, gather as much info on your WWs AP as possible and then share your evidence with the OBS.
Next, anyone that come through here and has to deal with an A should lawyer up. Regardless if you decide to R (reconcile), D (divorce), or even S (separate), they all come with different sets of laws in each and every state. Plus seeing a lawyer will take away some of the fear of the unknown. It really is an education lesson for you so that you know what your rights are and what to expect. This doesn't mean you have to file for D. This means you get to know all your options and make educated decisions going forward.
The A may or may not still be going on. It's tough to say. In my experience, and unfortunately I have a lot, dealing with a wayward is much like dealing with an addict. Without treatment, being open and honest, it's like white knuckling through sobriety. in other words, she is most likely still addicted to the A whether it's going on actively, if it's gone underground for a while, or if it's fizzled out. In my case my special wayward is still pining away for her AP 20+ years later. Long story there. Find out as much as you can about the A before confrontation.
When you confront, you may or may not want to have divorce papers in hand. When you confront, hand her printed evidence so that you don't leave her anywhere to go. You don't allow gaslighting or blame shifting. This is all 100% on your WW. Put the A squarely on her shoulders. There's no we were in a bad place, etc. Bullshit! An affair is all decisions on her part and not letting you know of any of those decisions. Definitely not a mistake either. Deliberate, conscious choices.
Gently here. You need to get yourself tested for STDs. Too many people come through here and find out they have something later. Please for your own health get yourself tested at the first opportunity you can regardless of everything else going on. And absolutely no relations with WW until she has been tested too.
Next up... the kids. It's great that you consider what's going on with them. However, and I can't stress this enough, you CANNOT let the kids decide if you get a D or not. If you know you are going to be miserable and can't stay in a healthy relationship long term, get out. THAT is my story. I'm not here as a BS (betrayed spouse). I'm here as a BC (betrayed child). My father tried to make it work for 6 years after dday. I grew up in a toxic environment where no one was happy. My father should have gotten out much sooner than he did. I have a whole other story there and is a big reason why I ended up here on SI.
Chances are your kids may know something even if you don't. I was the one that caught my mother and had to sit my father down on dday and tell him what was going on. My evidence was my mother's diary as this was 1989. Like you, I have all of the graphic details right down to how her AP tasted. I watched my father read that diary and I watched the life go out of him right there. I will never forget that look. But there were many signs before dday like phone calls, my mother being out at weird hours, etc. Chances are, if your WW was bold enough to have her AP in your house, your kids may have met him at some point not knowing what he really was. Your WW didn't just betray you, she betrayed the kids as well.
If you really want to help them, depending on their ages, you can get them into IC (independent counseling). For either direction. If you end up staying and R, they will need help in dealing with the fallout in your house even if they don't know about the A. Their environment going forward is forever changed. It's what you do with that environment is what matters. You can even call the school to let them know that there are issues at home and to get recommendations on child psychologists. Otherwise start looking for one now. It often can take months to get your kids in to see one. It's not something that can be done spur of the moment. This is also something you do with WW after confrontation as you should do this together regardless of what happens.
Sounds like you have started to do the 180 already. Good. I will have some links below that explain in more detail You should do the 180 for now in order for you to detach and get into a better head space so that you can make better decisions.
Consequences and not punishment. Your WW needs to face consequences of her actions. All of the above is a good way to start. Once you know what you are dealing with you can start to talk about getting finances and living arrangements in place should the situation go south. Another reason to have already seen a lawyer so that you can make those decisions.
NC (no contact). As soon as confrontation has taken place you should both send a no contact message together. By doing so this marks the place in time that she should have absolutely zero contact with her Ap going forward. If she does, you should have enforceable consequences for your WW. See links below for some suggestions.
That should be a good start for now. Here are some links to get you started. You can find most of the abbreviations here in the upper left corner in the Healing Library. Please check that section out.
http://www.survivinginfidelity.com/library.asp
Read up on the 180 so that you can start to use it. The 180 is designed for you to detach and can be found under BS FAQ here:
http://www.survivinginfidelity.com/faq_bs.asp#FAQ11
And more 180 info under the target threads here:
http://www.survivinginfidelity.com/forums.asp?tid=598080
http://www.survivinginfidelity.com/forums.asp?tid=232785
I would also recommend reading these target threads in the Just Found Out forum:
Tactical Primer
http://www.survivinginfidelity.com/forums.asp?tid=235051
Great Posts for Newbies to Read
http://www.survivinginfidelity.com/forums.asp?tid=361740
Boundaries and Consequences 101 for all new BS
http://www.survivinginfidelity.com/forums.asp?tid=385631
Before You Say Reconcile...
http://www.survivinginfidelity.com/forums.asp?tid=406548
Before you say reconcile...Recover!
http://www.survivinginfidelity.com/forums.asp?tid=561390
For the newly betrayed
http://www.survivinginfidelity.com/forums.asp?tid=535178
For the foggy, unremorseful, cake eaters:
20/20 Hindsight: What I should have done when I J F O
http://www.survivinginfidelity.com/forums.asp?tid=446349
Codependency in the Marriage: A BS’s common mistake
http://www.survivinginfidelity.com/forums.asp?tid=408443
My 10,000th post - You Are Going To Be Ok
http://www.survivinginfidelity.com/forums.asp?tid=502703
Another Great Post for Newbies to read
http://www.survivinginfidelity.com/forums.asp?tid=532395
Please read these as well as prep for any sort of upcoming confrontation that you may have with your WS:
http://www.survivinginfidelity.com/healing_library/confrontation/no_contact.asp
http://www.survivinginfidelity.com/healing_library/confrontation/boundaries.asp
Calling all BSs...:
http://www.survivinginfidelity.com/forums.asp?tid=514479
Choosing an IC/MC:
http://www.survivinginfidelity.com/forums.asp?tid=544948
So very sorry you are here OA. Keep reading. Keep posting. We are here for you.
yop