I don't know if she would, but if she did, how long do W's stay away for? Months? I'm trying to figure out how long this process is.
If you get lucky, I'd settle in for at least 4-6mo of ups and downs. What helped me continue was realizing the best first steps for "staying" or "going" were similar--detachment and GAL. Key factors in how long to stand, IMHO, are the duration of the relationship and the presence (or lack thereof) of young children.
+ Kristin arrived in Oct and her partner returns in Jan (3mo), before leaving again in Mar (5mo).
+ May arrived in Sep and I believe her partner gave up the AP in Feb (5mo). He's back to monogamy, and the situation seems promising, but he's not quite ready to reconcile.
+ CWarrior arrived in May and my partner was back to monogamy, intimacy, and fun trips by Nov (5mo), but I pulled the plug when she kept screaming and I got exhausted making backup plans based on her mood.
It's a good question. I'm surprised when people start, then give up 2mo later no new skills learned.
(Those may do better to just go no-contact and move on.)
