I felt really sorry for Stephanie and also for Debbie.
The thing that struck me was wondering how much staying together was a default or a choice.
The interviewer asks "And so you guys obviously you decided to stay married and I wonder, and I want to address this question to Stephanie first. Was this kind of like a default choice or was this an active choice on your part where you're like, 'I want to keep the family together'. Did you get to a place where you were like, 'Okay, I'm good with the marriage again, despite those rocky years during transition where I was kind of the glue holding it together'. How did you come down on staying together?"
Stephanie replied "I've been thinking about this quite a bit over the last few days since knowing this was coming up. If I'm honest, it was a default position, but it was a default position that I actively chose, that I did want, if I could hold the family together then I wanted to do that. Obviously now, we're in a situation where all three children will have left home in a couple of days’ time. And so it just raises the question again, 'Well, is that still the default position?' and for me it is yes. It has been a rocky road, but there is an awful lot of shared history now, which is important to me, and we're looking ahead longer now one point. As I said, at one point, I said, 'Can I get through the next three hours?' whereas now we're looking ahead and saying, well five years’ time, 10 years’ time, 20 years’ time, what will it be like? So we can see ahead further into the future."
I just don't really understand how much was a default and how much was a choice but I really wish Stephanie all the very best. And I guess, by default, that must mean I wish Debbie all the very best too. (Actually, I do). 
I don't think any woman (or man) ever needs to stay in an unhappy marriage but I can see why Stephanie stayed initially. I guess I just hope she continues to stay only if it really is right for her.