Told him I couldn't stop thinking about him and he smiled?

After sex, I told this guy that during the past few weeks I couldn't stop thinking about him. He smiled (like a nerd being complimented by a pretty girl). Then he tried to seem cool by saying that he has that effect on people (he was trying not to smile when he said it). Does this mean that he likes me or is it just sex?
Told him I couldn't stop thinking about him and he smiled?
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