Before I respond to your original questions I just wanted to touch on a couple things from your follow-up post:
You said:
I am always afraid for what the future holds for us. Sometimes answers seem so clear and other times they don’t.
It sounds to me as though you are trying to find some certainty, or as Pema Chodron would say, "trying to put ground under your feet". The thing about life is that nothing is static. People change. Feelings change. Everything changes. Nothing is permanent.
Pema Chodron has a book that I think you might benefit from reading, it's called The Places That Scare You. I also have a mod-approved link to a YouTube video of hers with a similar title in my profile that you may want to consider checking out.
The reality of this lifelong pain is almost unbearable at times
I'm not sure I understand what you mean by this. Could you expand on it please?
Now onto your original questions:
Do people truly find their marriage is better after an affair (obviously with work)? How or why? What makes it better?
Better is such a subjective term with many definitions. If you define it as I do, which is "improved in health; healthier than before", then yes. Our M is "better", because we are healthier as individuals, and as a result our relationship is healthy as well. We have become more authentic as individuals, and so our M is more authentic too. The healing we did on our individual selves provided the foundation for our M to heal from infidelity.
For the betrayeds, do you ever feel like you’re lying to yourself or burying your feelings in order to reach R? What makes R real or fake for you? What was it that finally made it a place where you were ok? Maybe not healed or great, but ok.
I am not one to bury my feelings or lie to myself - what you see is what you get. There was never a moment where I held back on anything I was feeling - if I felt sad, angry, hurt, vengeful, or any other emotion, it was out there front and center. My H lost his job shortly after dday and we were together 24/7 for about the first year and a half after I discovered his A. I had severe PTSD and could not regulate my emotions at all for a very long time. To his credit, my H learned to stay with my hurt and pain, anger and triggers. He faced the damage he had caused and didn't try to avoid it. He showed me compassion, understanding, and empathy. He consistently validated that what I was feeling was normal and to be expected after what he had done. That said, it took some time for him to get the place where he was able to do all of that consistently, but the key for me was that he didn't give up working on it.
What made R real for me was seeing him balancing supporting me in my healing while simultaneously working on himself; seeing him stay with all of the discomfort and no longer running away or trying to change it; and, seeing him mature, grow and transform himself (psychologically).
Is happiness after an affair a myth? The numbers are clearly against any marriage surviving that has had cheating. The reality of staying together, even with work, seems like such a fairy tale. Is love just not enough?
No, love is not enough, and there is far more to it than "staying together". Marriage requires work, and effort, and patience. It requires authenticity, vulnerability and understanding. It requires mutual compassion and empathy. These things are even more important in a relationship recovering from infidelity.
Personally, I place more value on feeling peace and contentment than I do on feeling "happy". And I can tell you that I feel a complete sense of peace and contentment in my relationship with my H.