Keep the message proportionate
Use the shortest explanation that still tells the truth about the event, impact, and current position. For a message about how to ask a friend to send fewer messages, use this factual base: name the recurring contact, request, topic, or behavior and the effect it has on you.
Give timing that can be trusted
Give a realistic date, a simple option, or a direct yes-or-no question and avoid vague promises such as soon. State the limit, any acceptable alternative, and what you will do if the pattern continues. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Close the loop without drama
Do not diagnose your friend, list every past grievance, or threaten public embarrassment. For stalking, threats, coercion, or self-harm concerns, preserve evidence and use appropriate crisis or safety support. A calm ending is more credible than a warning, a grand gesture, or language designed to provoke a response.