My WW never complained to me about anything. That's not an exaggeration. It's not that I just ignored her complaints. She really did not complain (even now she cannot or will not point to anything specific). So I was completely blindsided. Right up until the end she was telling me she loved me (apparently in her mind it was a sibling-like love). So how could I possibly know in the future whether she was faking it or not?
That sounds very much like Prisca. Somewhere in 2010 she has a post about how she felt that her Giver nearly ruined our marriage. She nearly never complained (and when she did complain I didn't address the problems or didn't address them in a timely way). She basically felt that she shouldn't complain.
The great thing about the Marriage Builders program is it is like a manual for clueless husbands like me to tell us what our wives need even if our wives don't tell us or can't tell us. Your wife needs 15-30 ours of your undivided attention each week. You probably don't need anywhere near this much time, but she does. That time needs to be spent meeting the four intimate emotional needs: recreational companionship, conversation (featuring the four friends of good conversation), affection, and sexual fulfillment. Regardless of what the husband and the wife rate as their "highest" needs.
And the marriage needs to be free of Love Busters. No demands, disrespectful judgments, or angry outbursts.
I CAN PROMISE YOU THAT NEARLY EVERY SINGLE HUSBAND HERE IS UTTERLY BLIND AND CLUELESS WHEN IT COMES TO RECOGNIZING THEIR OWN DISRESPECTFUL JUDGMENTS. Even today after years of effort I still sometimes say something that Prisca finds disrespectful, with no clue in advance that she is going to feel that way. I keep honing my skills. You have got to be super, super good at recognizing and eliminating disrespectful judgments if you want to be a good husband for most women. Most women I'm aware of will not nicely tell you that you have been disrespectful and help you understand; they will just curl up and withdraw from you. So you've got to figure this out with almost no help from your wife.
And of course no dishonesty; total radical honesty; no independent behavior; perfect adherence to the policy of joint agreement.
Beyond that, full integration into each other's lives; she is fully invited into every "room" in your life.
Almost every woman will be happy if she has all of the above, and unhappy if she does not. Many women will not tell you if you are missing the mark on some of this, though, so you need to get help honing your skills (never miss a Marriage Builders Radio, and practice helping other husbands learn to not be disrespectful and to empathize with their wives), and you need to solicit regular feedback from your wife (even if she doesn't often take you up on the opportunity).
My guess is that like most husbands here you were missing the mark on some of the above, even if you think you were doing great. Most husbands who come are are missing the mark, and most get pissed off and/or ignore us when we tell them, but giving heed to this and tuning up "husband" performance is one of the main keys most guys who come here need. Don't be satisfied with peacefully coexisting; that is enough for most guys, but not enough for most women.
All of that said, we all know that you can be doing everything absolutely perfect and your spouse can still have an affair if they do not keep good boundaries. So you want to be snooping at times until snooping feels boring. And you want to be the kind of person who, if your wife enjoys a friendship with another man, would without hesitation declare it to the world on a billboard.
If you remarry in the future, it would be good to discuss all of this ahead of time. A woman who is in love will usually feel great about most or all of the above.