we just have to wait for updates 2 and 3 joe... hope we will get answer to some questions raised here than create more questions for the reader.
if you are talking about the couple not talking about the dinner at boss's house, it has been discussed in this thread like most other events in the current update. as to the reasons to y they didn't talk about it clearly it's obvious if they did the story wouldn't go beyond this update(that's my thoughts if you want other views read the older posts). to be more critical about the last conversation between the couple at the end of the update whatever theories we come up with we just have to wait for the next 2 updates to connect the dots to get a valid reason for the events of update 1(i hope that they are answered).
the dev did say it only gets darker and even if people like ntr this kn takes it to another level hence it draws in the reader. as
SC Stories has said again and again this is only going to get darker and most readers here have to some extent resigned themselves for the worst possible outcomes (the dark endings that have been posted here) if not all or some who are just here for the conclusion.
i had this same question the first time i read this kn regarding y there so many situations the go against common sense. and i posted that there are too many porn logic situation to make sense of how the story is progressing. as i reread the kn multiple times either to get screenshots or to check the theories of the posts here, it became more evident that its the readers level of immersion into the kn that rationalizes the way the couple reacts to situations (their own life experiences or regarding what a happy marriage is or how society made them so). sometimes i think this kn felt too real like the way the story is going... will not go into why or the reasoning, ills let the people with such experiences elaborate if they have similar thoughts. having said all that, there is not definitive answer to your question for now at this stage of the kn and we just have to wait for the next update.