Not a jerk at all, it's hard to understand exactly what someone is saying online. I'm not saying men are not able to understand, just the bond is stronger ( if I were saying that, I'd be saying that I can't either ).
There's still the possibility that he did not know she lost the baby before they went separate ways. Because he clearly said something like "I don't understand what happened and / or changed".
You'd have to be quite the dimwit to not understand why suddenly a woman would feel this way after such an experience.
I was actually quite shocked at first and that's why I theorized that it's possible he wasn't aware at the time of the break-up because someone can't be so insensitive ( in my mind ). Although, people have shown me otherwise in the past.
This could also be the typical Japanese salary man not understanding anything else aside work, work... and work.
But I'm going to give him the benefit of the doubt until proven otherwise.
Also, for those that think they're going to hook back up, are you nuts? There's just too much pain associated with that relatively quick ( shotgun marriage ) relationship. This might not be a yuri end, but there's no chance in hell that this relationship rekindle.
I suppose it is more likely that he doesn't know, just because both of us agree that there is no way someone could be that big of a jerk and call themselves human :P but if that is the case then it definitely proves that keiko was not attached to him in any other way besides the kid, so much so that she didn't even feel obligated to tell him about losing the child.
so yeah, no way they are getting back together. not only because what I mentioned above, but because if the author wanted to have a resolution with this guy then the author would have introduced him in a different way. I see this as a way to advance the relationship between ran/kieko, maybe not towards yuri but still a way to bring about some drama.
still hoping for a yuri resolution though :)