Unfair we're not somewhere misbehaving for days
Great escape lost track of time and space

from Arctic Monkeys – R U Mine? Lyrics on Rap Genius

Meaning

He feels it’s unfair they aren’t spending their time together.

He just wants to be back to how they were when all they’d do is stay together and “misbehave”

Also, lovers usually take getaway vacations and stay in a lot making love (“misbehaving”) until they lose track of time and space. He’s wondering why they aren’t doing that.

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