What does it mean if my crush called me “ma'am”?

Anonymous
I'm Latina and I traveled to the United States to the state of Arkansas, I met a boy who I liked and before I left I gave him a gift, and he said "thank you ma'am", but he did know my name... it was a way of rejecting me or was he just polite?
What does it mean if my crush called me “ma'am”?
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