I think this is a good idea. Probably didn't have to share about how you feel about him, or what you plan, but it's done now, so don't tell him again that you love him, or that you are distancing yourself, etc. He may see that as trying to manipulate. Just do what needs doing with no explanation (you don't owe him one). All he needs to know is anything pertaining to the children, and business (such as finances and any other legal stuff).
Don't worry about what the future may or may not hold. Take it one day at a time, and try and live in the now with as much integrity as you can, without pursuing your H. You are right that you can't be his friend right now .... that is too much to expect of a LBS ... I sometimes wonder why these WAS's even imagine that that is a possibility, then I remember that they are in MLC, and totally illogical, and not themselves at all.
Just realise (and, I think you have) that even this semi-darkness is going to be difficult so keep yourself busy when he has the children. For now, focus on YOU, not trying to save your M, but trying to save yourself and move through this crisis with as much dignity as you can.
And, of course you're scared and sad ... totally normal. I was terrified during that time of my sitch. Oh grief, I had no idea what I was going to do. I think most of us, if not all, go through periods of sadness and fear, then we find a spot of peace and clarity, and detachment, and those periods get longer and longer. Just keep focusing on the NOW, and being happy within yourself, with or without your H.
Thinking of ya!
Me:57 H:52 M:28 Got another lawyer last year and filed. D35,S/D twins28,D22 EA4/04 End? Who knows? "Life is like a mirror. Smile at it and it smiles back at you." — Peace Pilgrim