Find a new MC. Seriously, if he is already looking to "blame" someone he is not going to be therapeutic.
A good therapist would get the information of what your M is like now, and historically, and take things from there. Certainly not placing blame on anyone in the first session.
Don't go back, your H is trying to own what he did, and is working toward fixing things. All you need is some douche telling him it's not all on him at a time where he may feel weak, or tired of being the one that needs to fix himself. KWIM?