I'd love to hear the rational thinking behind that statement that says physically separating and living separate lives is a good thing for a marriage: quite the opposite, people get used to living separately and without the other person and it can be very hard to reverse that once a person gets used to this.
I'll say it again, separation is a prelude to divorce: separate living equals separate thinking.
Why then are you so quick to suggest kicking out spouses having affairs as a way to save the marriage? I know you will have a good answer for this, but would like to read the rational.