Why do we always "want what we can't have"?

Lioness_81
Does anyone know if there is a specific evolutionary purpose to wanting what we can't have, and why the desire to have something we know is wrong or that we know we can't have seems to increase to sometimes obsessive levels (and then decrease if we get what we want as we realise we don't really want it)?
Why do we always "want what we can't have"?
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