On this song SZA talks about being with someone she knows doesn’t love her but she believes him when he says it’s, also she’s hoping when she meets the real him he doesn’t change.
SZA could be implying that her fame is causing her to have an inflated ego. In a literal sense, gravity is the force that pulls one to the ground. Therefore, gravity will “pull” her down to earth, or allow her to remain humble.
On the other hand, SZA’s rise to stardom could cause her to feel as though she’s up above others. Therefore, she wants her lover to remind her that she is simply a regular person, despite her fame or success.