Promise me if I cave in and break
And leave myself open

from Eminem – Space Bound Lyrics on Rap Genius

Meaning

This metaphor makes no sense when you look at it closely. When a cave caves in (no pun intended), it is anything but open

It actually means that eminem wants to “cave in” to love and “ and "break” down barriers and “leave {him}self open”.

Promise if he let’s his guard down and trusts someone he won’t get twisted for doin it

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