Final answer:
Without specific context or content, what Sebastien's therapist says about him cannot be determined. The therapist's insights would typically cover his mental health and behaviors.
Step-by-step explanation:
To provide an accurate response to what Sebastien's therapist says about him, we would need specific context or content from a book, case study, or another source in which Sebastien is a character or subject. In literature or psychology-related discussions, a therapist's insights on a character like Sebastien might touch upon his mental state, behaviors, and progress in therapy. Without the appropriate context, it's impossible to answer what Sebastien's therapist says about him specifically.