How do I tell a guy that I don't want to talk to/date him?

So my friend likes me, and we text all the time and he's really nice to talk to as a friend, and we started talking talking a couple weeks ago, and now he wants to start dating. The more we talk in person, the less I like him, because he's an entirely different person, and everything he does just makes me feel weird and like him less. I don't know how to stop talking with him, so any ideas? I know I sound bitchy, but he just makes me uncomfortable.

How do I tell a guy that I don't want to talk to/date him?
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