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It sounds like the singer and their lover have had a nice time alone together, and so are focused on each other that it's like they're on their own planet, but now it's time to get back to life outside, so they've got to "leave the planet".
It sounds like the singer and their lover have had a nice time alone together, and so are focused on each other that it's like they're on their own planet, but now it's time to get back to life outside, so they've got to "leave the planet".