Two characters may make the same promise in very different circumstances: alone in a kitchen, then in front of a room of witnesses. The words match, but the scene gives them different pressure.
Count the listeners
Choose a fictional promise and list everyone who can hear it. Separate those physically present from anyone the speaker expects to hear about it later. A witness may interrupt, approve or remain silent; each response becomes part of the scene.
Ask what the character risks by withdrawing. Embarrassment, a damaged friendship and a practical obligation are different possibilities. Support your reading with what the passage shows instead of assigning the same motive to every public declaration.
Return when the promise is tested
When the story revisits the commitment, notice whether the original audience still matters. Perhaps someone quotes the exact words, or perhaps the person who heard them has disappeared.
For a reading note, pair the first promise with the later moment of difficulty. Explain one change between them. This keeps the discussion close to the novel’s construction and opens a better question than whether the character is simply trustworthy: what does this particular promise require, and who gets to decide whether it was kept?



