Don't tell*
Don't share*
Pinky Promise*

information you tell someone when you want it to become public knowledge by morning
or (luckly)
information only two to three people were supposed to know

*Don't tell
Do not go tell your best friend this information because you know you can trust her/him

*Don't share
Do not talk about this to any other living thing than to your dog or cat (sometimes fishes are allowed)

As simple as that

Putting your confidence in someone forming a bond with him or her and knowing that you can rely on them for anything

The owner of the secret

The receiver of the secret
Person being trusted

The most sacred, serious, vowel anyone can ever swear to. If broken, you must suffer some serious consequences. These promises come straight from the heart and are sworn to value.

hard won, easily lost, and never fully regained