I really need help?

A guy I have been knowing for a little while says he can't resist me and want to be with me 24/7 and only want to be with me and no one else. I am the only reason what makes him happy. He is a very needy person. I don't really feel the same strong feelings as he does and I want him to step back a little, but not be rude about it. How can I do that?
I really need help?
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