I can see how you would feel nervous about this. He is still bound by professional confidentiality standards. My T happens to be a member of my church and at church we nod and say, "hello" and that is it. In his office I bear my soul and I don't think he is watching me at church for symptoms. He is practicing his spirituality. That is his time for himself. Your former T will be more worried about the curriculum of the class and making sure the material is taught and presented the way it needs to be for students to understand it. If you have to have private meetings with him for the purposes of the class, he should be able to keep it to the subject of the class. It wouldn't be a bad idea to mention your discomfort if you have to have private meetings with him for the class and set soem boundaries. He is a therapist. He understands boundaries. I hope that helps.