Of course I echo all the previous comments of how awesome this is...
My favorite part is that Donna is 4 months pregnant and Ronna can tell; it makes me happy.

Also, thinking back to the last season and how much Mrs. Santos complained about having to do things and changing her routine, I can actually see a lot of this taking place.
I'm not totally sold on the idea that he's been having affairs for years, but I can see how her resentment and complaining might lead him to shut her out and do this.