My son trusted the school resource officer with personal information that was repeated to others
Arrest records are public records. They may include detailed information about the person arrested, the incident leading to the arrest and the victim. These records can be closed if their release would endanger an ongoing investigation or public safety. If the person arrested is found innocent of the charges, he or she may ask to have the record sealed and claim they have never been arrested.
There isn't a right to privacy attached to public records. Those who promise not to share the information may be under a moral obligation, but not a legal obligation, not to share what is a matter of public record.