First off, I know you've already heard this but I hope you'll let it sink in this time...
THIS IS NOT YOUR FAULT. At all.
Nothing you do (or fail to do) can cause another person to abandon their own value system. What this means is that your WW's stated value of fidelity is NOT something which is truly valued by her.
Marriages don't cheat. People do. So, it wasn't about you working a second job in order to take care of her ungrateful ass, and it wasn't about you napping on the weekend. It's about your WW's defective character, that gap between what a person claims to believe and what they actually do. Your WW cheated because, underneath whatever lip-service she gave to the contrary, she doesn't truly value fidelity. She doesn't believe in it. And this propensity for cheating was ALWAYS there.
You didn't cause it. We develop our value system in childhood.
Now, I'm not saying that people can't change or that they can't learn to value honesty, integrity, fidelity, etc. But it's very difficult. It takes an inordinate amount of introspection and work... and it's more rare than we think for a WS to actually get it done.
After reading your posting history, I'm also concerned about your WW's total lack of empathy... and that's me giving her the benefit of the doubt and not writing her off as merely cruel for cruelty's sake. The things she's said to you are unacceptable. The fact that she continued to cheat for months while watching you struggle in pain... is unacceptable. These are HUGE hurdles going forward because now you're looking at the repair of defective character *and* somehow instilling some empathy from the ground-up. You're not a bad guy if you don't want to take that on. It's a daunting prospect.
You've got littles to think of, and that makes it harder. Your WW, as she is today, is no fit role model for them. Without your steady guidance, she'll clone that character defect, so it's really important that you learn to set boundaries and that you do what you need to do in order to be the best dad possible, R or D. Your kids need at least ONE sane parent. Most studies agree that children can deal with adversity as long as one parent is stable and involved.
You don't have to rush to any decisions. Your best bet is to see an attorney and get your ducks in a row. That will allow you to keep your options open while you're processing the adultery and strengthening yourself, both emotionally and physically through good self-care.
If you will allow me to influence you on a few things today, let it be these:
Truly accept that you didn't cause this,
that cheating is always about the cheater,
and that there's nothing you could have done to prevent your WW's adultery.
And finally, that you WILL be okay. Believe it.
Strength to you.
ETA: I thought I had lost that earlier post, so this one is a recreation of sorts. I've been losing quite a number of longs posts lately. So frustrating.
[This message edited by ChamomileTea at 6:42 PM, February 12th (Wednesday)]