What do I do when he texts less frequently?

I’ve been texting this guy for 1,5 week and he has been very active with texting me good morning and texts during the day. We have been talking about deep stuff and he has been hinting a little bit about the future. A couple of days ago we decided to meet up next weekend. But he has been texting me less frequently, answering me takes longer and is kind of sending me one sided texts to me and it’s not as sweet as it was in the beginning. I’m really confused. He answered my text yesterday but it was one sided, no question back to me or anything so I haven’t replied to it. Before we texted multiple times a day and now we are not. It gives me anxiety when I’ve noticed change in his behavior towards me. Advice?
What do I do when he texts less frequently?
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