And than I hit the door, cause baby I got to go
Oh yeah don't act like you don't know
I know you've been through this before

from J. Cole – Purple Rain Lyrics on Rap Genius

Meaning

Cole is saying that she should know by now that they had nothing more than a one night stand and that she should be understanding once it’s time for him to leave. This girl has faced this moment in her life often, therefore, she shouldn’t act like it’s a surprise.

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