What to do when a guys interest and effort has slowed?

I’ve been talking to this guy for a few months now. He says he likes me and enjoys my company and having me around. We get along super well and have intense sexual chemistry (we’ve been intimate but not had sex yet) but he doesn’t seem to be pursuing as much as he was when we first started seeing each other. He will go days without calling or messaging me to the point where I always end up reaching out to him. It’s been a few weeks since he initiated any communication first and it’s starting to bug me. How can I get him to start making more of an effort again?
What to do when a guys interest and effort has slowed?
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