By someone else, we've both been someone else's someone else
And the problem is neither one wants help
It's an addiction and it can't be fixed
Our family's mixed up, there's a baby sister in the mix

from Eminem – Love You More Lyrics on Rap Genius

Meaning

Both Em and Kim have been in shitty relationships where they felt like they were the second choice, which helps to explain why neither one can trust eachother.

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