Forever isn't for everyone
Is forever for you?
It sounds like settling down
Or giving up
But it dont sound much like you girl

from Arctic Monkeys – Snap Out Of It Lyrics on Rap Genius

Meaning

He’s trying to appeal to her senses by disparaging the dude she’s with now…That he’s not “forever” material.

And to bring up settling down in the same breath as giving up further adds to the whimsy of his approach.

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