I don't think Kevin necessarily really wants a child. I think he just assumed, without giving it much thought, that he'd have kids, cuz 'that's what people do'. Not to say he doesn't want them but I don't think it's some burning desire/need for him, at this point, anyway. Who knows?
My guy and I never say really mean things to each other (I definitely did, in my first marriage, and hey, no shock we're divorced), not even at our worst, not even in the heat of anger (we don't really fight), but still, both of us were like: "dude, just tell her you were mad and frustrated and left a mean message." And he did, and Beth is pissed and I get it, but the message itself, of course, isn't really the problem, hateful as it was.
I thought about Kate and the baby with Sophie too...I hate that they just dropped that Kate and Sophie were good friends as kids. People lose touch, grow apart, etc but I'd still want to know the big news about someone who used to be a good friend, let alone one that was almost my family.
I thought about When Harry Met Sally too, and the 'cold hard Mexican tile' line, when Zoe was talking about good reasons to not have kids.