I don't have any experience with rehab, Deelilah, so can't really speak to it.
Seems from my reading around here that they can be very different in approach.
I'm with you. It's your husband's rehab and he has the right to talk or not, as he chooses.
I would worry that anything I might share might prejudice the counselor in some way.
I dunno. As I said, I don't have much experience in this matter.
Hugs.