My H knows about my transference, and he sees the pain I am in and is supportive to me in that vulnerable place- when I can show it to him, which is hard- even though- he knows about that my feelings for T are stronger (currently) than for him- he also understands that the feelings are from the past (thus their terrible intensity) and not about the present- and will not be acted upon. I've explained to him and he understands (better than my T does, apparently ) that it is a natural part of therapy, and that it almost has to happen. So he actually comforts me when I am able to let him, in the middle of the transference pain. There are times when it has brought us closer together because it opens my heart and he sees my pain, and then I can feel his love. I think the same might happen for you, if you let your wife see your pain. My own H is probably nervous to sign up for individual therapy himself because he sees the agony I am in sometimes and is afraid it will happen like that to him. As long as your T can keep her boundaries securely in place, it is normal and acceptable to continue. But- you know the best, your situation, so this is just outsider feedback, use it only if it is helpful to you, of course.
I'm glad you have another T to help and to turn to, in any case. I'm so sorry that this has transpired, SBR..I would send the email, if you can't talk to her about it in session.
BB