Keep in mind that thee is not much you could have said when the bomb was dropped that would have made a difference. It typically is not the time to say anything. The other person is just not listening. It is at times just time to walk away and say nothing.
Letting him lead during the bomb allows them to take control. Which is good to a point. Don't beat yourself up for not doing anything.
As far as your statement.. it looks good. Except for the words you bolded. The idea is to not be emotional at all. You define your faults and leave it at that. You don't talk about the future.. or any plans you have. By stating that you will move on.. you imply that you are still holding on. You show your hand.
So.. with that said.. how would you create an opening to use your statement?
Sorry my posting is limited but typing this out on my phone is not great fun. I will be back home soon though.
Relax Eat Think Act normal React.. Smartly. Do something different. Emulate. Do Work.
