I feel like I should communicate some of this to him so that I can relax my shielding and behave more neutrally to him while knowing that he is aware of my position and that the adjustment in my attitude towards him is for me and not him.
The first half sounds good. Tell him: "WAH, I wish you just dropped off the kids, hugged them and left. That's just how it is now." Period, no explanation. That's why I'd drop the second half: don't tell him why, don't tell him it's for you. Speak only with your actions.
M39 D6 D3 (at S) S 2014-09 D 2016-09
"You can't start a fire sitting around, crying over a broken heart" - Bruce Springsteen.