Perhaps you can both see them for IC and MC.
My S/O and I do both, but we do it all together.
We do 50 minute sessions back-to-back. But we are both present. Obviously, given some of the underlying issues, trust is an obstacle. To remedy this, we're both present for all sessions.
I am present for his IC.
He is present for my IC.
We both attend MC.
All through the same therapist.
There are no secrets. No private discussions. Nothing subversive or covert. We have an amazing therapist and after alot of painful work we're happier than ever.
Whether you do IC, MC, or both...please just see someone. It helps enormously to work through thoughts, pasts, emotions, and behaviors in a nuetral environment with an unbiased person interested only in helping you become healthier and happier.