Riddle

I am too much for one but not enough for two. Give me to a third and I am gone. What am I?

Choose an answer

A.A rumor
B.A promise
C.A whisper
D.Secret
Hint: It's a word with 6 letters, starting with "S".

Answer

Secret

Why this is the answer

A secret feels like a burden for one person to keep alone, isn't really "shared" between two, and once told to a third person, it stops being a secret at all.

This riddle is filed under "What Am I?" Riddles and rated Medium.