I understand your views on not being healthy because of the constant contact. Like you I see you ex 3 times a week which is a lot when people are no longer together. Like you I couldn't heal (well I'm still healing), so to protect myself I have decided to go dark with ex only contacting him when it's about kids.
To be honest it is doing me good as I find it helps me to heal faster ( well as fast as I want really). The good thing of going dark is that when I had to meet him for a kid's issue I wasn't attracted physically to him and if I had to meet him in town I'd not pay any attention to him.
This is only my experience but maybe going dark will help you to better heal. I admire your strength.