How to fade out someone you just started dating

Her message is asking about a plan you already know you don't want. That's the signal. She's not asking for your feelings, she's asking for logistics, which means she's probably still in the phase where she's moving forward on the assumption you are too. You don't need her to be upset or pushy to justify a clear reply. The fact that you've already decided is enough.

Check how long it's been since you last engaged. Two or three days of a slowing rhythm is normal and gives you a window. If it's been long enough that she's already started to wonder, the window is getting smaller. The longer you wait, the more the message reads like a surprise instead of a natural end point.

The move here is to answer the plan itself, not the feeling underneath it. Acknowledge that the date was nice if it was, make it obvious you're not going to Saturday, and say so without a hedge. Something that closes the loop is better than something that keeps the door partly open. If you say you're not sure, she will reasonably treat that as a yes to talk about later.

Keep it short and specific to what she asked. You can say you've enjoyed getting to know her but you don't feel the connection to keep going, and that you didn't want to leave her waiting. That gives her what she needs to stop planning, and it respects her by not making her decode it.

Send the reply the same day she sent the plan, or at most the next morning. Waiting until the day before turns it into a cancellation, which is harder to read and gives her less time to adjust. If you wait longer than a day, the silence itself becomes part of the message, and she'll reasonably assume you were avoiding her.

If she doesn't reply, that's an answer and you don't need a follow-up. Don't send a second text asking if she got your message, and don't add a clarifying line later. One clear message is the whole job. If she does reply with a question or pushes back, answer it once, plainly, and stop. You're not negotiating the decision, and continuing the conversation past that point reopens the fade you were trying to close.