I think it really brings us to a new level when we understand happiness. I can't say when you will reach that level but when you do, you will care less if your W is happy or miserable. I bet if you asked your W she would say you wronged her terribly. So who is more right by being wronged? Does it matter?
I do believe once you start to detach (even just a tiny, tiny bit) some of your thinking will really shift.
You will never again in your life had another weekend dated Aug. 20-22, 2010 with your children. Ever. So, you can allow negative thoughts for even ONE minute to tarnish the weekend or just let things "be".
What does detachment look like to you? I realize detaching is not something any of us can do on command but IMO you have to start somewhere. Where would your somewhere be?