Man I feel for you. You are a big man to still want your wife through all that, but is apparent you love your kids. You can't stay in a marriage for the kids, but the kids are a reason to try to make it work.
I posted this before, and I will do it again.
One of the main reasons I came back to my wife (though she my leave me anyway). Is because she was kind and gentle and showed me NOT told me of her unconditional love.
If she begged and pushed, I would be in the OW arms right now!!