I think the missing part for you john (in following up with woog's post) is the spiritual part. You see, it became a whole lot easier for me to eat away the time when I really understood "if it is meant to be". Simply put, it is. Meant to be, commanded, ordained. However you want to word it. You and your W belong to each other.
If you get to a point where you are ready to understand "hope" and "faith", you'll find the peace you are missing. And by faith, I not only mean the spiritual aspect (God), but faith in yourself as a good man and a loving husband and a great father; faith in your W as someone who really does love you and is sidetracked; and faith in your M and R. When you get there, then the unconditional part or agape love is easy. There is nothing my wife can say or do that will sway me. It is all just circumstances. She knows it. I know it. And contrary to my therapist who still thinks I'm in denial - my D will be busted. And I'll venture to say sooner rather then later. It's truly about faith. Once you have it, the peace follows.
Me - 43 and She -36. No kids. Married 7 yrs - Together 14 yrs