I think statistically speaking: a lot of men do leave when they have another person lined up. But this is not the hard fast rule. Also many men leave with the mentality that "if this doesn't work out, I'll just come home." And leaving is sometimes a relatively quick decision.
But for WAW's there is a lot of thought and anguish that goes into it and women are less prone to have someone else waiting for them, but again, not the hard rule.
I read How to Improve Your Marriage Without Talking About It and that's where I learned a lot about that, per my DB Coach.
