FWIW, many counselors will tell a couple NOT to talk about big issues between sessions. This keeps the pressure low between sessions, and it ensures that what you both want to say is said in a supportive environment with a greater chance of the other partner really *listening*.
IMHO, I would tell your H that you will only discuss certain things in the counseling environment.
The trouble with having an open mind is that people put things in it.
My sitch - Divorce Busted! http://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=1804137#Post1804137