Why do guys backpedal on what they say?

why would a guy tell you that he likes you, feels a connection towards you, etc then immediately backpedal on that? why bother to tell someone how you feel about them if you don't intend to see where it goes. I could see, maybe, a younger man getting nervous but not a grown man in his early 50's. I'd like some feedback on this especially from the men out there.
Why do guys backpedal on what they say?
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