Ma, our time together is our time together, and uh
Our time apart is our time apart
So love Jay with your mind girl and not your heart

from Jay Z – Girls, Girls, Girls, Pt.2 Lyrics on Rap Genius

Meaning

He’s tellin her straight up that they won’t be together for long. And in their time apart, he’s with other bitches which is why she can’t love with her heart (get attached).

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