Heck if this is all OK, then screw MC and just use the MC money to hire some nice call girls every now and then "while YOU work on your marriage". After all, it's OK.
Well, that's not HOW I'd recommend spending the money, but this IS one of the reasons why I usually don't even recommend bothering with marriage counseling when there's a third person involved. It's a waste of everyone's time, and the family's finances (unless insurance or EAP completely covers the cost). Even Retrouvaille won't take a couple for a weekend if one of them is still actively involved with an affair.