Reading this forum, I see therapists doing inappropriate things all the time but in this case, this is about your overreaction and jealousy, not about the therapist doing something inappropriate. What was the therapist's spouse (?) supposed to do exactly? Hide in the car with dark classes and camouflage clothing? It's not like the therapist talked to you about their spouse/gf/bf. The person was merely sitting in the waiting room AFTER you had left. This is about you.