The idea that since Peter and Elias are serving different entities they have kind of no feelings attached relationship when they are outside of their apartment or whatever they agree upon as the neutral ground.

You know little murder attempt here or ritual sabotage thete is fine that’s just business no need to mix it with personal relationship.

“No, Peter, this divorce isn’t about that murder attempt even though I don’t think you really even tried but that’s not the point right now. However you used my favorite mug again and haven’t even washed it afterwards; this is unacceptable!”