Emily,
you sound like you have such a sound head on your shoulders and that you and your soon to be ex are really separating like adults. I commend you both for this and your son will for sure benefit.
Our situation was so the opposite that I'm more than impressed. In fact my daughter's father hasn't spoken to her in 5 or more years. She wouldn't recognize him if he walked up and did speak now.

And he offered no assistance when it was over either...I'm still working on the debt and horrible credit issues he left me in.
In the long run, I did decided that we are better off without him if he can do this to both of us.
Kimberly