Make the first sentence usable
Lead with the reason for writing so the recipient does not have to decode a long emotional introduction. For a message about how to decline an invitation to a date's home, use this factual base: refer to what actually happened, what you want now, and any personal information relevant to informed consent.
Reduce the work of responding
Offer simple options, a narrow question, or a clear update that can be understood without another conversation. Make one clear invitation or boundary and leave room for a different pace or a no. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Respect the boundary already visible
Do not flood someone with messages, demand exclusivity, or use vulnerability to create an obligation. Meet safely, protect personal information, and stop contact when a refusal, block, threat, or deceptive identity is involved. A block, explicit refusal, legal restriction, or safety plan takes priority over the desire to explain more.