I might just text you
Turn your phone over, when it's all over
No settling down, my text go to your screen
You know better than that

from Childish Gambino – Heartbeat Lyrics on Rap Genius

Meaning

CG still texts his ex. When she receives it, she turns over her phone to ignore it.

Things she does not do:

CG is saying that after we’ve lost “the one”, we still keep a spot open for them even as we start new relationships. He’s telling her, “Don’t ignore me; you know better than that.” This all implies, of course, that she is cheating on her man with him—she turns her phone over to hide the notification.

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