M,

After giving this some more careful thought, I'm going to give you some options:

#1:

"H, I don't appreciate you trying to put words into my mouth. This is between us and should be handled like adults. If you wish to discuss our separation with the children, we must come to an agreement on what we will say to them together in the same room. The reason for this is to avoid confusing them and what we will tell them needs to be age appropriate."

#2:


"H, you need to realize that I do have a busy schedule and am not able to respond to you in a timely manner. This is between us and should be handled like adults. If you wish to discuss our separation with the children, we must come to an agreement on what we will say to them together in the same room. The reason for this is to avoid confusing them and what we will tell them needs to be age appropriate."

#3:

"H, you need to realize that I do have a busy schedule and am not able to respond to you in a timely manner. If you wish to discuss our separation with the children, we must come to an agreement on what we will say to them together in the same room. The reason for this is to avoid confusing them and what we will tell them needs to be age appropriate. This is based on the therapist's general recommendation."

~~~~~~~~~~~~~~~~~~~~
If it were me, I'd go with either option 1 or 2. If there is no therapist, I'd go with #2.