SMW, It sounds like you handled the dialouge well. You let him know that this won't be a cake-walk (cake-eaters aren't welcome at this banquet.)

Quote:
However, I ended up in a real funk on the way to church trying to figure out what was so awful that he needs to walk out on me, on the kids, on our life together.


This is a struggle isn't it? You recognised your shortcomings and are addressing your issues. You have made healthy positive growth for yourself. Don't fall into the if I do this then I will fix us trap. You can't change him. Here is when you have to self-validate because you are not being validated by DH. The funk - caused by doubts about yourself.
How to de-funk:
Pray
Make a list - all the positive growth
what you are grateful for
all the people who love you
stay busy
do something nice for someone else.
read "Oh the Places You Will Go" - Dr Suess, to your kids

You are handling it. It's OK to get in a funk, lose focus and feel bad. Self-awareness of it is good, then feel it and keep moving.
Cheers
Coach


M22,H45,W45 S21/18D12
Retain faith that you will prevail in the end, regardless of the difficulties and at the same time confront the most brutal facts of your current reality, whatever they might be.