Why would a guy kiss a girl still even if he felt unsure about there being chemistry/attraction? Is he lying to himself?

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He said he isn't or unsure about attraction but still agreed to kiss me. Why is that? Can that happen over time? Is he confused or doesn't know how to go about it?
Why would a guy kiss a girl still even if he felt unsure about there being chemistry/attraction? Is he lying to himself?
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