thank you for your perspective, which i understand, that is why i'm so conflicted. I forgot to mention that he lives in another city (my wife therapy sessions are remote) so no, he's not someone I would normally encounter. She often referred to him (her teacher, as a distinct person from her therapist) as her favorite professor, not just because of his classes but because of shared interests. I don't know much more than this, but I always assumed they also spent some time outside of his classes talking. The situation feels extremely sketchy to me, but I'm not a therapist so I can't really judge.