SBJ - I don't have good advice but can sympathize at least and yes - have my own story.
My W has held her affair as a closely guarded secret. I made it no secret to her that I was also holding that secret out of love of her and a wish to not see her be hurt. "Protecting her" was a phrase I used.
On pre-move-out night when she told me she was leaving we did talk a bit. She was shocked both when I told her that if she was never coming back that I would feel no need to even be cordial to her. The next blow was when I told her that if she were no longer part of my family that I felt that I would have no duty to continue to protect her secrets.
They live in fairy-tale princess land where everything works out for them just as they wish. Truth darts - carefully applied are quite the shock to them.
On BD H52, W50 T27, M26 S21, D23 BD-9-Mar-16 D-15-Jan-18 Final-19-Apr-18 I am a storyteller. The story may do you no good. But a story is never for the listener. It is always for the one who tells