I am not sure that I would because being a therapist and knowing what i know about complaints and how they are handled, really leant entice me to file a complaint.
I often thought about filing a complaint about ex t, there are so many good reasons to, she broke so many codes of ethics but truth is I can't hurt her just yet because I am still so deeply attached to her. If I ever was going to file a complaint I would tell her first. Truth is she knows she has crossed my boundaries, made sessions all about her, etc... in her head she did what she did because she thought she was being congruent. I wouldn't stand a chance filing a complaint against her, she has an excellent reputation and my complaint would be grist for the mill.
I hope that you decide to do what is right for you ATAT because nobody else knows your circumstances. I think that it's important to have enough support in your life and self support to go a head and file a complaint, it's a huge loss to lose a t and to lose the trust you once had in them, it's Avery traumatic process especially if the complaint is dismissed or goes in favour of your t, that could be devastating if you are any way vulnerable right now