When children are involved its a whole different situation than when one has grown children & don't have to be anywhere around the other person. Friendly BUT NOT FRIENDS, is a good way to explain it. Even with my grown daughter I don't say bad things about her dad but I also don't keep quiet about the things he has done....but only provide facts NOT opinion because her own opinion is what is what is important for her to form. I have actually been surprised at her opinions that she has expressed. Some have been more negative than my own. Surprising because I always thought she was closer to him than to me but that has changed as she has observed his behavior.

Honestly I would totally limit my interaction but then again, you are only separated & some communication is necessary unless you are planning on ending the marriage. I have been separated 9 years because I couldn't afford the divorce. He never communicated when we were living together & it didn't change after I left though I made everything go through email & he doesn't get my new phone # because he abused it by giving it out as a reference & they called me when he defaulted on the loan. Lol if they had called me BEFORE giving him the loan I would have let them know how irresponsible he is financially & they wouldn't have given him the loan unless they wanted him to default.

Separation is NEVER easy & when kids are involved even more difficult. Limit the interface as much as possible for your own sanity & functioning that you have to do between the 2 of you