I really respect the work you are doing.
I have a few thoughts.
One is that the relationship with your MC is not happening in a vacuum. Your husband is right there, yes, as it is marriage counseling?
Sometimes transference can operate as a distraction. Like, we obsess about the therapist so we don't think about other things....and in this context I wonder if you are making as much effort on understanding your dynamics with your husband as with your marriage counselor, and focusing as much on the inner life of your husband as your therapist.
The other thing....the "maybe I love her more than you"--that is very difficult and I am sorry for that.
But could your husband be getting a similar message, from you, about your marriage counselor?
If any off this seems off base, I apologize and mean no offense. I just know that I can get caught up in thinking about my relationship with my therapist and, while I do learn from that, I sometimes think I dwell on it instead of concentrating on the people in my life that I need to do relationship worth with.