How to tell someone you don't want to see them again after one date

Right now, the other person is checking their phone. They're either thinking about a second date or they already know it wasn't a match. The only thing they don't know is what you think. Your message either confirms what they suspected or delivers new information. Either way, they're waiting. If you don't send anything in the next few days, they'll assume you're not interested but they won't know for certain. That gap is where false hope lives. People sit in that space and convince themselves you're just busy, or you'll text tomorrow, or maybe you didn't get their Snap. A clear message closes that.

Your message needs to do two things. First, it tells them the decision is final. Use words like "I don't think we're a match" or "I'm not feeling a romantic connection." Don't say "right now" or "at this moment." Don't say you want to hang out as friends (unless you actually do and you mean it). Second, it respects their time. You're telling them this soon so they can move on instead of waiting. The whole thing should be 2-3 sentences. Longer messages make it seem like you're trying to convince them or soften the blow, which actually makes it worse.

Send the message within two days of the date. Not immediately (that looks harsh) but not a week later (that looks like you forgot about them). They may not reply. That's okay. A lot of people don't reply to rejection messages, and that's a normal response. Don't follow up. If they do reply, keep it short. "Thanks for understanding" or a single line is enough. This isn't a conversation. If they ask why or push back, you don't need to debate it or list reasons. You've said what you came to say. After this message goes out, there's nothing else to do.