Less communication after…?

I’ve known a guy for almost a year and we recently started talking again. When we first started messaging again, he’d message me back consistently throughout the day and typically until around 11:30pm. Not too many breaks in texting. Over the weekend, we were intimate for the first time. Now, … texting has slowed. A lot. We’ve messaged around 5-7x/day (shorter, one-line texts) over the past two days, and he doesn’t reply past like 9:30pm anymore. So obviously, this is triggering anxiety in me because it’s such a dramatic shift. When I saw him over the weekend, he was saying how “men are simple” and how he’s a “nonchalant guy.” But my mind is racing. Did he get what he wanted and is slow-fading/ghosting? Did the PNC hit? Or Is he just not as concerned with texting me so much because he feels like he has me already? And most importantly, do I say something?
Update: I tried to subtly bring it up because I knew I wanted to at least have a conversation before I’d see him in person again. He said how things are better, not worse and was surprised that I was stressing. He basically said “don’t overthink it” (if he’s still interested etc). So I don't know what to think.

Less communication after…?
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