You could also have said that where you come from, couple means two people in a romantic relationship. This doesn't mean that it can't also have other definitions. Every US English dictionary I checked has "an indefinite small number" listed as one of the definitions, and that's a much more common usage in my (US) experience than using couple to mean exactly 2.
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Where I come from (US) a couple means 2.
You could also have said that where you come from, couple means two people in a romantic relationship. This doesn't mean that it can't also have other definitions. Every US English dictionary I checked has "an indefinite small number" listed as one of the definitions, and that's a much more common usage in my (US) experience than using couple to mean exactly 2.