Write from facts rather than momentum
Pause long enough to remove accusations, assumptions, and details that belong to someone else. For a message about how to respond to a false cheating accusation, use this factual base: state the claim, where it appeared, what can be verified, and who actually needs the correction.
Offer a proportionate next step
Match the size of the request to the relationship and to what the recipient can reasonably decide now. Ask for a correction, removal, or direct conversation and keep an accurate written record. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Protect privacy on both sides
Do not publish private evidence, speculate about motive, or recruit an audience to punish someone. Use school, workplace, platform, legal, or police channels for threats, defamation risk, intimate material, or impersonation. Use the most private legitimate channel available and do not share the exchange to recruit support or pressure.