He wants exclusivity but you barely know each other yet

A text asking for exclusivity after three or four dates is telling you two things at once. He's enjoying your company and he's ready to stop dating other people. Both of those can be true while the two of you still don't know much about each other. Pay attention to whether he's asking about the relationship or about your reliability. Someone who's excited about you will usually say something warm alongside the ask, like missing you or wanting more time together. Someone who's anxious about losing a spot may frame it as a clean rule with no room for discussion.

Also notice what the message leaves out. If he hasn't yet asked about your life beyond surface details, or you haven't had a conversation about what you each want, the exclusivity question is arriving before the information it depends on. That gap is the thing to name, even if you don't name it in those words.

The reply needs to do three things. It has to tell him you're glad he asked and that you like spending time with him, so the answer doesn't land as cold. It has to be clear that you're not agreeing to exclusivity yet, so he doesn't spend the next day assuming you're fine with it. And it has to give him a next step that's concrete, like a date you're already planning or a conversation you'd like to have in person, so the question doesn't just hang there.

Keep the hesitation short. You don't owe him a full list of your reservations. One clear sentence about wanting to get to know each other better is usually enough. Longer explanations invite him to argue the point, and then you're negotiating something you haven't decided.

Once you've answered, the next few hours and days carry as much signal as the words. If you reply warmly and suggest a plan, he'll read it as interest with a boundary. If you reply and then go quiet for two days, he'll read it as a rejection even if you meant something softer. Respond within the same day if you can, even with a short message. If he pushes back or seems hurt, don't rush to fix his feelings by changing your answer. You can acknowledge that the timing feels different for each of you, and keep your position.

If he keeps pressing after you've been clear, or makes the question feel like a condition for seeing you again, that tells you how he handles a boundary. Early on, that's worth paying attention to. Stop escalating the conversation and let the next few dates show you whether he can respect a pace that isn't his.