If her stress level goes up with the addition of each partner isn't that her problem. Aren't these her choices. Who's idea was it to open their marriage after 12yrs?
I don't think you should concern yourself with the problem with mark and her ...again everyone made a choice. Unfortunately you might have a ring side seat to some unpleasantness or the break up of a marriage but she might not be a good listener.
I'd voice what you think is important for you....good luck.
Last edited by dingedheart; 06-29-2012 at 03:19 PM.