It is important that you feel comfortable sharing very personal information with your therapist. The trust between you and your therapist is crucial to the success of the process and all information is treated as entirely confidential. However, there are exceptions, where the therapist may have to break confidentiality. These are; if a client discloses information about committing a serious crime or gives information about a serious crime, discloses any child or vulnerable person at risk of harm, discloses a risk to themselves, a risk towards others, or if a client is at risk of harm from others, then your therapist is legally/ethically bound to seek professional advice and possibly pass on information to appropriate agencies. Client notes are entirely confidential and no outside party has a right to request that they are seen or content known. The only exception to this may be if such notes are subpoenaed in a court of law.
As a professional CBT/EMDR therapist, I receive regular clinical supervision to ensure the highest possible standards. This means that I may share some information in order to ensure best practice. The clinical supervisor is bound by the same rules of confidentiality and professional standards, conduct and ethics.