Baby, Daddy ain't leaving no more, "Daddy you're lying
"You always say that, you always say this is the last time
"But you ain't leaving no more, Daddy you're mine"

from Eminem – When I'm Gone Lyrics on Rap Genius

He’s talking about a time when he had to leave and Hailie doesn’t want him to go, she knows that he always says hes going to stay but he always ends up leaving. At the end when she says “But you ain’t leaving no more, Daddy you’re mine” is her way of showing Em that he’s her father not father to his fans so he should be paying more attention to her

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