"I am so disappointed we can't talk. Once again I think a mediator will be good for the situation."
"This is extremely difficult for all of us. In the future, please do not approach me with issues when I'm preparing to leave for work. That time frame does not work well. I suggest we save all discussions till after work."
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Regarding your son asking why you just can't forgive mom, you probably need to tell him something like, "I know this is hard for you, and seems like it should be easy to fix. However, sometimes something happens between a H & W that is very painful, and they can't talk about the details to anyone else for a while".
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!
