You're getting good advice here Jen. Ali hit the nail on the head in response to your "I just wanted him..." statement.
You really need to figure out how to let go of your desire to control his life. Why do you care if he sees D after her first day of school? I'll answer it for you. It's simply because you want to control what type of person he is, what he enjoys doing, what his priorities are, etc.
You gotta let it go sweetie, or you won't get anywhere when you have so much working for you in your sitch.
So maybe he gave you a BS answer about what he was doing today that made it so he couldn't see D after school. It was probably a defense mechanism to either 1) not hurt you, or 2) not have to deal with your reaction. Either way, there's only one thing you can do about it...and you know what that is. (hint: It has nothing to do with questioning his answer, or blaming him for anything, or anything to do with him...for that matter.)
FLoyd The grass is always GREENER over the septic tank.