Being a therapist doesn't make one a good person. Throw the assumption that the therapist is a good person out of the window and proceed accordingly and with caution.

Use extreme caution when dealing with therapists who make promises they can't keep. For example, do not trust a therapist who tells you they will always be there for you.

Do not allow a therapist to manipulate you into disclosures with false promises or by proclamations that they can be trusted. Trustworthy people don't go around informing others that they are trustworthy in order to gain confidences. And untrustworthy people certainly have no qualms over lying about their trustworthiness.