Secrecy is the chastity of friendship.

Anything told to you in confidence is not yours to spend. Repeating it costs you nothing visible and costs the other person the safety that made the telling possible, which is why the damage is so easy to miss. Friendships hold weight in proportion to what can be said inside them and go no further. A friend who leaks is still pleasant company, but nothing heavy will ever be set down in front of them again.

Think of the last thing you passed along that was not yours. Say nothing more about it from here, and notice the small pressure to share as it comes and goes.