So I'm chilling with my girlfriend
But she not my real girlfriend
She got a key to my place but
She's not my real girlfriend

from Childish Gambino – Heartbeat Lyrics on Rap Genius

Meaning

He’s telling the girl he wants that doesn’t consider this other girl his real girlfriend because he wants the first girl. He and the “fake” girlfriend hang out all the time (she has a key to his place), but she doesn’t matter compared to the girl he wants.

In short, he’ll cheat on his “fake” girlfriend for the girl he wants.

Also, living well is the best revenge, and CG wants his precious ex to know that he’s not celibate or anything: he’s still gettin' it, just not with her.

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