The melody of I Hate U, I Love U by Gnash runs 623 notes across 79 bars, 3:49 long in F#m at 90 beats per minute. The tab sits low on the neck, mostly under the fourth fret, one note at a time — no chords to barre and no strumming pattern to keep up with. A piano backing track plays the chords and bass underneath, so the line you are learning sounds like the record even at half speed.
Prefer to strum and sing it instead? I Hate U, I Love U chords and lyrics.