Wonka is correct, just limit your interaction and words. No need to explain anymore, just give the facts.
I know it is a hard mode to get out of. When my D started I still felt the need to explain everything. Now I just give the facts. When I dropped off my key I just said "here is the key" nothing more.
If you have something planned or not there is no need to explain why you need to drop the kids off to her. Just give the facts.
My opinion is that I am D'd, my XW no longer has the privileges to my feelings or reasons behind my actions.
Be Joe Friday... Just the facts
M:34 XW:34 Together: 10y Living: 9y Married: 7y Son:6 Son:4 Separated: 12/28/13 Piecing: 5/2/14 Separated 2nd: 10/16/14 W filed, but pulled it: 11/5/14 papers served: 1/27/15 D final: 3/6/15