Why doesn't he text me first anymore?

So I met this guy a little over a month ago, and we've only hooked up three times so far because he lives more than 30 minutes away. Before, he used to text me first to make plans or ask how my day is going every couple days at least. It wasn't only him initiating first because I would also always take his lead and initiate too, and he would always reply quickly and enthusiastically and keep the conversation going. However, after the last time we had sex a little over a week ago, he never texted me, so I texted him four days later asking how his week was going, and he again replied in five minutes and kept the conversation going. It's been four or five days now, and no initiation from him. Should I text him again, or just wait for him? Our initiation is now about 50/50, but I don't want to come off as too clingy because I really like this guy. What should I do?
Why doesn't he text me first anymore?
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