This is such a difficult situation and I'm sorry it happened. I really don't know what I'd do in your shoes. But I hope you'll try to stay focused on what's really important here, and that's your therapy. You are trying to heal and improve, and you've taken the right steps by going into therapy and doing the work. Whether you choose to bring it up with T now, or later, or not at all, I think the important thing is whether you can trust her and progress in therapy. It may be that this is something you won't be able to get past, even if you talk to her and hear her side of the story.

Just focus on the therapy - you'll know in your heart pretty quickly whether you'll be able to continue or not.