Generally, the only time a therapist would tell anyone anything is if you were planning on hurting yourself or someone else. Get to know the therapist a little and you will most likely realize that his/her main goal is to help you, not to tell on you. Secrets are really damaging for most people. Not feeling like you can tell someone something is a heavy burden to bear. You don't have to tell everyone everything, but it helps to be able to talk honestly to someone.

Good luck!!