So, they were trying to deflect the common realisation that so many people discover that they never truly knew someone? And that sometimes, people are remarkably good at hiding aspects of themselves?
No, of course you didn't expect it. It's difficult to anticipate actions that you wouldn't do yourself. I don't like Phil McGraw much but I remember his observation that there are some aspects of everyday behaviour that would never occur to you as requiring a choice or open to question because they're engrained.
"Haven't you made a life decision that you will not steal? Refusing to be a person that steals is a life decision that you have incorporated into the core of your soul. You don't need to revisit this issue on a day-to-day basis, nor do you maintain an active, open debate about it...If you are short of cash on the way to the movies, you don't think, "Gee, do I stop by an ATM or do I rob this 7-Eleven?".
It would never have occurred to you that this "good man would do whatever he did.
Did the emotional/financial abuse occur gradually over time and then accelerate, or did it happen very abruptly. Or, impossible to know because it took time to be uncovered (in some way)?