Well to hijack Coach's analogy, your W probably knows deep inside that the lifeboat probably has a few major leaks too. If she loses the ship, she'll find out in a hurry.
I, like a lot of folks here, feel your pain ... your anger, and despair. Ask yourself honestly how much you want your M still, translate that into boundaries you can live with, and then communicate and enforce them.
But don't forget to be forgiving as well if the situation turns. I think forgiving is not a sign of weakness or backsliding necessarily.
Me 42 W 39 Married: 11 Jan 1998, T: Since 1992 First Bomb: Sep 2007 Confirmed A/OM: 4 Nov 2007 Kids: D10, S5 Reconciled and together again after (alot of) time and heartbreak. 3rd kid, S, born 2 Jan 2010.