Say you do not want another date
https://linespark.ifix.xin/conversation-guides/end-dating-follow-up-kindly/

Close the loop after a date with a clear answer that does not imply a future yes.

Whether the decision is about this plan or continuing to date



Any appreciation you can state honestly



The contact boundary you want from here


MY REVIEW / DRAFT


CHECKLIST
[ ] The message states the actual decision
[ ] I have not implied a future date I do not want
[ ] Appreciation is honest and brief
[ ] The boundary does not depend on getting agreement

Remove 'maybe' and scheduling excuses if the decision is final. Keep the message short enough that the answer remains easy to understand.