I'm thinking you're doing really well now, and that the doctor wants you to rely less on him. That's the goal of therapy, really: to help you become a self-reliant person.
However, I know, in the future, that you might need your therapist's support, particularly when extra stress is placed your way within your school or work environment.
Perhaps, you could tell him that you will need him as a "safety net" for the future, and tell him why.