It's good to get away on your own, but I'll offer a counter thought that was provided by DB Coach Laurie when I was contemplating moving away from the area where I live altogether. She said that the kids really need their Dad--especially when the family is broken. As hard as it may be for you and as much as you want to give W a taste of her decision--S5 and his needs remain the number one priority in his life. So if you are the cornerstone is his security, really think about any plans that would diminish the active role you now play in his life.
So you don't get me wrong, there's nothing wrong with getting a brief escape or vacation to recharge your batteries. However, if your thoughts are dominated more by how you can make W "feel" something as opposed to S5's needs, then you'll know you've crossed a line.
Btw, the past several days of Gospel readings have been from the Sermon on the Mount. Pretty powerful stuff on how to live a Christ-like life--especially saying to love your enemies since it's no credit to love your brother and even sinners love those who treat them well.