My new thread is in my signature "Newer game-Moving Forward"
I don't know how she defines "good friends" but I would think her best friend (who she is in serious danger of losing) is the guy watching her children and allowing her a warm place to live while she does THIS to him.
Nav, you need better friends, buddy. And make sure there is a mirror in the basement so she can look at herself in the mirror.
You will know the answer to your question when you can say without anger, resentment or regret, that you did all you could to preserve your family and that NOW, for the health of you and your children, and because you are a "changed man", you must move forward with your life. You are already on that path. It will become clear when she simply won't fit in it anymore.
that might be the wrong words, but you'll know when youe are "there"