while it can be different everywhere, the gist of it is: past tense is just that. if you are no longer a danger to yourself or others, then they have no real grounds on which to break confidentiality... and often times self-injury does not fall under that category at all unless your methods or history pegs you as at risk for serious harm from an episode of self injury (ie: you say you will remove a limb, or you have a history of severe self-injury that nearly resulted in death, you are at an addiction point where, while the individual instances of injury do not cause much harm, the cumulative effect could be serious... things of that nature). While it is not unheard of to hospitalize solely on the basis of self-injury, it is less common these days. It may be suggested that you seek medical attention for your injury, but, unless your T does not have experience with self-injury or you are a minor, they don't often seek hospitalization for self-injury... have you ever talked about it with your T? If you are still worried, you can always ask your T to review the bounds of his or her confidentiality. That way you will know exactly where you stand with that person.