Is It Rude to End Dating After Only Four Dates?

At four dates the question usually isn't whether you two are compatible in some grand sense. It's whether you want to keep spending evenings this way. Pay attention to what you feel when her name pops up in your messages. If you get a small drop, or you're mostly replying because you feel you should, that's information. You don't need a dramatic reason. Plenty of good decisions come down to just not feeling the pull.

Her messages will tell you where she is. If she's already talking about next month or mentioning things she wants to do with you, she's further along than you are, and your message will land harder. If she's asking open-ended questions and keeping things light, she probably hasn't committed, which makes a clean ending easier to give.

The main job of your reply is to remove ambiguity. Thank her for the time in one line so it doesn't feel dismissive. Then state the decision in plain words, something like saying you don't feel it going further. Skip hedges like maybe later or not right now unless you truly mean them, because she'll treat those as an opening.

Keep the reason short or leave it out entirely. You don't owe a full breakdown, and giving one invites debate. End the message there. Don't ask her a question at the end, because that invites a reply you then have to manage.

Send the message within a day or so of when she last asked about plans. Waiting a week makes it look like you were hiding, even if you weren't. Send it in the daytime, when you're clear-headed, not late at night when a message can read as either rushed or emotional.

If she replies with a question or asks for a reason, answer once, briefly and kindly. If she pushes back or tries to reopen it, say you've thought about it and your answer is the same. After that, stop replying to re-arguments. If the thread keeps going, mute it or let the conversation die. You don't need to keep defending a decision that's already made.