Why have things changed after sex?

I met this guy a while back. For weeks, we were talking all day every day, occasional calls/video chats. We started hanging out and started sleeping together. Ever since then, our communication hasn’t been the same. We still talk, but barely during the week, mostly on the weekends and we’ll hang out on weekends. When we do hang out, he’s very affectionate. He works a lot, and travels for work, but we were talking all the time while he was traveling when we first started talking. I’m having a hard time understanding what’s going on now? What changed? (Yes, I know what changed is that we slept together, I’m just trying to understand the change in communication and what it could mean).

Why have things changed after sex?
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