Where did guys get the idea there's only one woman for him. They still talk about it with everyone "She's the one"!! Is there just "the one" still?

That has been going on since forever. Dad's telling their son's that they'll know she's the one when you see her.
Where did guys get the idea there's only one woman for him. They still talk about it with everyone "She's the one"!! Is there just "the one" still?
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