Hi BobbiJo. I have been reading your thread lately, and your title makes me crack up : )
You just need to rip it off and tell them asap. Don't wait on your exh to help you. I had to sit down with mine and tell them by myself that we were separating. Ex of course wouldn't man up and help. It turned out okay.
Kids appreciate and respect the parent that will be open and honest with them. The longer you let this go, the more they may resent the fact that you haven't told them earlier. Yes it will hurt. I cried with my son, but we both came out of it okay. I think you need to do it now. The reason he keeps making these statements to you is that he is asking for reassurance...
"Success is the sum of small efforts, repeated day in and day out." Robert Collier
"One's best success often comes after their greatest disappointments." Henry Ward Beecher