Welcome to you, sir.
It is a common thing for us to add a lot of theory to the participant's goings on. With the exception of Kitty and Smith, who were actually living the drama, most of the regulars are leading normal lives. Okay, but this place is not normal. I get it.
As far as Linda and Tibor, and I was discussing this with my friend Pete, I believe this is just a "the honeymoon is over" thing. Pete is correct in that Linda was sick as a dog. There was no affair or lost baby to anyone's knowledge. They are just struggling to figure out what happens after you decide you want to be with someone for the rest of your life. After the fire subsides.