I had a dual relationship with a teacher who gave me private lessons. Though she wasn't a therapist, we had an intense instructional relationship which eventually went sour similar to how members describe here.

In many ways she was an outstanding, knowledgeable, patient teachers. But she frequent was late or otherwise treated me disadvantageously "because we're friends." When she made a very poor decision around my work, instead she focused the conversation on her personal crisis. When she was disappointed in my support for her marital separation--she left who appeared to me as world's sweetest, most devoted husband--she called me on the carpet with everything she hated about me, real and imagined.

I only lost a good teacher. It would have been far more complicated had I been tangled with her in therapy. She had no ethical obligations; I don't see her as a horrible person. This was role confusion that got away from both of us.