I see you interpreting your therapist as the enemy here. saying he was "threatening" you and "waiting to betray" you. you have to know that he is legally bound to do something if you intend to harm yourself or he will lose his job, he is not out to hurt or betray you. he is only concerned for your welfare and wants to keep you safe. please do not see him as the enemy.

as you are vague as to what form of self harm you are speaking of it is difficult to determine what will happen. if therapists think their client is a danger to themselves or others, the end goal is hospitalization. usually the danger part is the threat of suicide, not self harm. if your self harm is dangerous enough to accidently cause your death, then they would take action but therapist don't generally hospitalize for general self harm.