Like, what did you guys expected? To Kaoru drop everything and start cute kawaii (including kisses and sex) relationship with a child? I'm not saying they will not end up together somehow, but the path to this is exactly what interesting me the most.
I mean me too i want to see that. I didn't say either it will be easy for Kaoru to done all she had to do.
That and your no less painfully simplistic reading of what role it might have in the continuation of the story, yes.
What him not cheating mean for the story ? Doesn't that mean Kaoru still have someone she can rely on even with Uta leaving ? I know Kaoru is really fond of Uta but that doesn't mean she will be alone if Reiichi really doesn't cheat. It just need for both them to talk about that (i mean even if he is cheating they need to talk about that) and for Reiichi to be a better husband and Kaoru to be more autonom.