How do I tell my friend with benefits that I no longer want to sleep with him?

I think he’s dating someone now and I don’t want to cause a drama for another woman.
He’s been very secretive lately and not wanting to spend time with so this is how I figure.

He never wants to go out. He just wants to come over and sleep with me.
How do I tell him I just want to be friends?

How do I tell my friend with benefits that I no longer want to sleep with him?
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