One way....spending alot of time together at her place or yours means less time she gets to spend with wonderboy...which she didn't seem to mind...which is confusing. But allows you to show her the value of family time and you both spend more time with the kids.
Otherway...spending less time together allows her to feel the loss of the kids and your friendship....but also allows more time with wonderboy. But allows you to detox yourself so to speak from the situation. But less time with the kids when she has them.