I guess I qualify to answer.
So, my story is a little like The1stWife's in that I snapped and kicked him out and stopped trying to control the narrative, started working on acceptance that there was likely going to be a divorce. Got myself into therapy. Lo and behold, he did the same. And started to do the work, read the books, wrote the timeline, etc and started to make enough changes that I let him come back about 6 weeks later.
After individual therapy for a while, we started therapy as a couple. And tried to re-build.
There was an element of time sunk in my decision. We had been married for 28 years, together for 33. Money was certainly part of my decision making in that we are obviously better off together financially than apart. No kids, but honestly, my dogs played into the decision, too, and lifestyle.
I'm the sort of person who is pretty logical, and I'm quite aware that people have lived through much worse than I did just being betrayed. Not to make betrayal seem like a small thing because it's not but in the grand scheme of things, people have survived way worse things, imo. I tend to look at war, torture, rape, abuse, crime, etc as way worse than what happened to me. What happened was obviously emotionally painful but I still knew I'm a great person and he made shitty choices, and I had nothing to be ashamed of, you know?
Not going to lie, I am not always happy and at peace. My d-day was 12 years ago. I don't think about it every day. I feel that our marriage is somewhat tainted, and that I am more cautious than I was before. Trying to be more aware, tuned in. I miss the innocence. I'm mostly happy - after all, it was my decision. But I can't say 100% happy. Logical me says who is?