If she stays with OM thats her decision; you cannot influence it.
If she returns to the marriage thats her decision; you cannot influence it.
Just move on and keep her in the back of your mind in case things change. Don't count on it and there is nothing you have to do; the onus and responsibility for making a bad decision is 100% hers.
Not a bad position for you to be in since you risk nothing. She however could lose big time from her actions.
Together 15 years, married 7, 1 child, age 7.
WH: 37 y.o., EA/PA since March
OW: 26, 1 child (not WH's)
Me: 34, BS
Separated Nov. 16, 2013
Does a wedding anniversary still count if you are separated?
I am getting to a point of just backing off completely, but we still have certain level of contact because of our D and DD arrangements. Trying to keep it strictly business, but I have to admit that it breaks down at times.
Thanks for the support and info.