Being the one who keeps a secret makes you the one who hears the important stuff.

Discretion is rare and people test it without telling you. Something small gets shared, and what you do with it decides what comes to you next. Hold it and you become one of the few places information is safe, which means you end up knowing what is actually going on. Pass it along for a moment of being interesting and that door closes permanently and quietly.

Take the next thing someone tells you in confidence and simply do not repeat it, including the version where you tell one person. If you are not sure whether it was private, assume it was. Ask before you share rather than deciding for them.