Girl my head, space is limited, so I ain’t even room in the back of my mind
That’s why I ain’t thinking about you, I don’t got time

from Bad Meets Evil (Ft. Slaughterhouse) – Loud Noises Lyrics on Rap Genius

Meaning
  1. Wordplay on Space and Time: an infinite entity. Eminem’s thoughts are infinite but nevertheless, you don’t take up any space in his mind.
  2. Also plays off the idea of “space” and “room” like someone is looking for a place to stay and not even the back is there room for you to stay.

His first album is also Infinite. So he has infinite space but none for her.

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