Second this, I would have loved this if he has balanced scenes of being shown his cunning in politics whilst acting the way he does rn with Nav maybe with a bit more tact...
He just acts that way to her. ( can't remember if they showed it in the novel at this point or in the coming chapters.) He's a little devil behind her back, I think the ex-husband uses this to threaten him. It caused some drama but only for a moment.
Why is Henry character getting so childlike, he has lost his charm of the earlier chapters and doesn't suit Navier anymore.