When I started therapy over the death of my mom, my H thought it was making me worse. He was very concerned and even asked me if I was having an affair because I would be gone for about an hour after my session. He told me to ask T. what he could do to understand. She asked him to come in. That was probably 6 months ago and he now comes in with me once a month. It's been very good for him to hear how transference works and her perspective. And, she will ask him how I am at home and give her insight on how my mom used to treat me.
I think it has helped him learn to tolerate my irrational thoughts and behavior and support me when I'm sad after my sessions. Because of him understanding more, I've been able to talk to him more about it.
It did test our marriage but from my end. He kept questioning the therapy, my whereabouts and other personal stuff. So, the best thing that happened was for my T. to ask him to come in. I just asked her this week if he needed to come in anymore and she said oh yes. I think she recognized my strong feelings for her and didn't want them to interfere with my marriage, our communication, etc.