Mine knows, and supports my going, and is also supportive of the fact I've had to stop working for a couple of years because things got to crisis state for me mentally. He has struggled with this, because understanding what is wrong is difficult with any mental problem, but he really wanted me to get better so encouraged me to get help. For him it was essential for our relationship that I sought outside help. He was there for me when I needed him, but was reaching the limit of what he could do without feeling overwhelmed. There is only so much you can ask of a person.
I tell him a little of what things are coming out at significant stages in therapy, but he is really focussed on results rather than details.