Cause when them checks clear, they're not here
It seems as though the friends he “thought” he had (and considered family) are only there for the money he has. This is similar to the times how the same dudes who made fun of him in the past would act like they are his friends because of Gambino’s fame.
To help improve the meaning of these lyrics, visit “V. 3005” by Childish Gambino Lyrics and leave a comment on the lyrics box