As time goes by, the language between the two
The colors that each one has don’t mesh, yeah

from G-Dragon (Ft. Sky Ferreira) – Black (Sky Ferreira - English Version) Lyrics on Rap Genius

Meaning

As they go deeper into the relationship, the communication between them gets worse and they realize they aren’t that compatible.They aren’t “speaking the same language” or understanding each other and their separate colors/personalities don’t mix well.

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