How do I nicely tell someone to leave me alone?

So I’ve been hooking up with this guy. It’s kind of a situationship. I like him, he likes me, we hang out, we have amazing sex etc. Except we’re not ‘dating’. We hang out maybe once a week or so and to be honest, I love what we have going on but I honestly need a break and want to be by myself for a while. How do I tell him this nicely without hurting him?

Updates
+1 y
Three weeks ago, I blocked him without saying anything but I didn’t know how to tell him to leave me alone. He came to my house looking for me and so I had to pretend like something happened to my phone.

Please help me.
How do I nicely tell someone to leave me alone?
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