the whole situation probably seems way less "funny and weird" and way more "how do I murder Aaron and get away with it."
To add to this "Nick feels humiliated" theory:
All of the dumb, gay stunts that Nick pulls (like showing off the fridge in Vegas) seem meant to try to embarrass or humiliate Aaron on as big of a public stage as Nick can manage. They don't always play out that way, but this seems to be the intent.
Nick was humiliated, so he has to try to humiliate Aaron even more in order to tip the scales, so that he can signal to everyone that
actually it is
Aaron who is the embarrassed one, not him!
In the time since Nick got arrested and everything was exposed, Nick has shared all sorts of drug stories, all sorts of stories about him fucking April, all sorts of other details... but he
really doesn't like talking about a few very particular topics, or acknowledging when his peers or chatters mention them.
He's Mr. Lolbert telling people to say whatever they want until somebody superchats the wrong thing, and then he has to go into his "stern-yet-passive-aggressive" voice about how that is just not appropriate, he's given you all your warning, and the next people to talk about that will be banned.
That's the shit that really gets to him. That reaction isn't for show, or to withhold information for legal reasons, or to protect other people. He's actually humiliated by it, and he can't let anyone else know.
One of those subjects is how he's neglected his kids (to an extent—he's happy to talk about them if he can use them as a shield, or as a way that lets him throw out random "pedo" accusations).
The other subject is how Aaron fucked the shit out of Kayla. Nick
never acknowledges that. He always talks around it and moves past it as quickly as possible like it was never even said. He fucking hates that it happened.
I don't think Nick cares about Kayla. He only cares that Aaron embarrassed him and told everyone the truth about what was happening in the polycule
It's hard to tell what Nick actually cares about. And I certainly agree that it's possible that Nick doesn't actually care about Kayla as a person.
But I think that he does care about her as "his wife" in the titular sense, in that she's someone whom he should've kept to himself. He should have prevented other men from having sex with his wife, and he
definitely shouldn't have knowingly allowed and facilitated it happening.
Nick may not care about Kayla's status, or honor, or reputation, or whatever you would describe it as—but he definitely cares about his own, and about the fact that it has been irreparably damaged by letting The Toe defile his wife.
Maybe we're saying the same thing. I might be getting lost in the semantics.