Hi Justabouthere, I can tell how much you love your wife and your family, and how willing you are to help her, and to absorb pain and difficulty to protect your family. This is wonderfully loving, kind, masculine, and in keeping with your marriage vows.
Your wife believes (probably not consciously, but somewhere in her subconscious - she does not want to bring these thoughts into her consciousness) that it is OK to give sexual gratification to another man, and it is OK to accept sexual gratification from another man. This is unambiguous from her actions. Whether or not the physical acts have happened, whether or not she states this in words, this is what she believes. This is a belief that may eat away at your marriage slowly or may lead to an implosion. Like termites in the foundation of your marriage.
The kind of love you need right now for your wife and your family is love that is combined with wisdom. Perhaps even if you are not religious you can connect with the difference that the ancient Hebrews drew between wisdom and foolishness. Foolishness, in their view, was not innocent or naive. It was dangerous bordering on evil, because it led to destruction, disorder, pain that radiates to others, and chaos. If your wife was diagnosed with cancer, you could probably go back to normal living the next day. To spare her the difficulty of facing reality and to protect your children from the devastation. Would that be wise? Kind? Loving? Or foolish?
I understand your relief during days that feel like the temperature is lowered a bit, more normal. But there is a kind of energy around crisis that propels change. It worries me when people don’t take advantage of crisis (though usually I’m talking to waywards, I think it might also applied to betrayed spouses). I know you can’t live in that state, but I encourage you to seek temporary relief from it and then return to it as much as you can. We change when we fail and we change when we are so uncomfortable we can’t stay in the place we are. When we are comfortable, we don’t change. That’s true for your wife and likely true for you as well.
I am sorry you are going through this.