The 4-minute breakup ballad is now on YouTube and other digital platforms.
It contains the lyrics: "I don't hate you. No, I couldn't if I wanted to.
I just hate all the hurt that you put me through. And that I blame myself for letting you."
People.com said that since Steinfeld teased the song title earlier this week, fans have been speculating it is about Niall Horan, the 26-year-old, former One Direction singer she broke up with a year ago.
Steinfeld, 23, can now be seen in the Apple TV+ series Dickinson, which was recently renewed for a second season.
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