Released posthumously, this song finds XXXTentacion singing about how a former girlfriend broke his heart. His ex is portrayed as being "filled with poison." In other words, she was a toxic lover.
It is likely X is referring to his past tumultuous romance with Geneva Ayala. The rapper-singer was arrested in October 2016 after she accused him of physical and verbal abuse. He protested his innocence and was released under house arrest.
Ayala is featured on both the cover art and music video to "Hearteater."
X's heartbreak over the breakdown of their relationship is a prime topic on his first two studio albums, 17 and ?; this theme shows up on the tracks "Sad!" and "Changes."
LA-based songwriter John Cunningham's production features soft acoustic guitars, a contrast to the hard-hitting sound that XXXTentacion usually rapped over.