Most wayward spouses -- and nearly ALL wayward women -- have an enabling friend, usually a girlfriend, and maybe more than one that they surround themselves with. Has she cut off or pulled back on her usual relationships with friends and family, and gravitated toward a new small circle like this?
My W also. One of her friends left her H the same week my W left me, and another was widowed 2 years ago and is now living the happy single life.
How are kids supposed to learn how to have healthy relationships, and solve problems by working on them when they are getting this kind of example from their mother? When the going gets tough, run away from the problem and maybe it will all go away.
As much as I am heartbroken for myself, I am more so for my 2 sons who I feel will be permanently damaged by this. That is one of the big reasons why I think I can't detach, because I never want my sons to think I gave up. It's bad enough when one parent is a quitter.