30 years and left my wife

After 30 yrs of marriage I finally left my wife.
The last 10 yrs have been very difficult due to her severe menopause .
anyway things started looking but only for me to find out about her Emotional affair with lots of graphic photos sent both ways, they were planning a hook up at his house when I was away for a week all planned out, but for some reason he called it off.
my wife was quite devastated by this and sent him lots of grovelling texts.
I found out and threatened her with divorce but we both decided to have counselling to fix the marriage.
anyway fast forward a year and I have just recently found out that the texting has been going on again for the past 6 months.
I left her 3 weeks ago and she is on the way to a mental breakdown begging me to come back and saying she cannot go on with her life as its so empty and she may as well kill herself.
I cannot get away from her as we are both instrumental in a very successful family business where I have to interact with her daily.
my biggest problem is I have already given her hope that I will move back home just so she can get out of this manic depression she is in.
I really really do not want to go back, my life vis so much better now and I would rather we go our separate ways, but what can one do with a wife who is the mother to my wonderful adult sons and I really just want this to be easy on her, even after what she has done.

any advice accepted