This is what I told my H when he was spending 16 hours a day at our house and then leaving at night and attending functions as a family. I told him it made it more difficult for "right now" for me to spend that sort of time around him. It still caused a lot of confusion and that my Pschy and heart wasn't healed yet and it would take time and in time maybe we could do stuff together. But I was honest and shared with him that it hurt to not be able to touch him when we were spending "family" time together, not be able to "share" with him like I so needed..... I was honest with about why it had to stop and he understood.. I wasn't emotionally ready to do that. Plus it confused the kids and made them have hope that we were "working" it out and such so for that reason and my mental health I had to stop it. Just explain it to him. It will confuse your kids at this point to continue on this way.
M:47 M:18 D16, S19 1st S 1/08-5/08 Reconciled/May 7, 2008 Left again Nov 9, 2009 I Filed: Nov 17, 2009 Final: April 14, 2010 EX walked away from kids too