What is the best way to end something that never started?

Things weren't, and I don't think ever will be, official with the guy I'm talking to at the moment. I'm just really starting to see through him I guess? I used to think he was really sweet, but now I think he's just a charmer. How do I end it without sounding mean, and I just can't stop talking to him because I would feel horrible. He said he wants to talk about us being serious when he comes home from visiting family, so what advice do you have for me...like what could I say?
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FYI, I don't want to end it, but I feel like it just might be the best option...I'm really confused.
What is the best way to end something that never started?
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