Hi Surfer, I often think dim is a 'safe' choice. By dim, I mean not initiating contact and responding briefly and pleasantly to contact she initiates. I don't really think dark is possible where you are coparenting or have ongoing 'business' to resolve.
In any contact, you can always just stick to areas like the kids, business and briefly passing the time of day. That's pretty much been my approach with my XH and I expect to be even darker once our house has sold and everything is concluded......looking forward to that xx
T 13 M 7 Me 48 H 46 SS 15 BD 7.14 PA D final 5.16 (H filed)
We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus