Yes, it was inappropriate and plain unprofessional. He assumed that he knew your motivations based on the fact that you are "young" and "pretty". It's not his place and his job as a therapist to either "read" your motives or to make you feel better or to comment on your appearance for that matter. It's his job to help you to understand what motivates you to do what you do in life and to see the potential consequences so you would be able to make conscious choices.