Keep in mind, you do NOT have to report it, if you feel like you can't. If you can, that is great, but if not that is OK too. My concern is that you seem to feel bad about feeling unable to report, as well as blaming yourself for HIS choice to abuse someone who was vulnerable and trusting.
You are supposed to be able to trust your therapist. It isn't your fault when they abuse that trust.
I wish you continued healing and growing happiness.
PM me if you want.