Storytime collaboration

Well right off other than a love of dancing and wellness they seem like total opposites. Toss in commitment issues and this relationship was on rocky ground from the start. She sounds like a intellectual and a homebody, he's a jock and the outdoorsy type. You could go a couple of ways, they divorced because he's always running around looking for the next adrenaline rush instead of being there with her and the kids. Either one could break it off because they suddenly realize they can't stand being tied down with a family and a relationship, or they could mutually agree that they both aren't entirely ready to settle down even though there are kids involved now.

Personally, I'd pursue the he's too into being an adrenaline junky that isn't there for her and the kids, and when he is, he isn't intellectually stimulating enough for her.