The melody of Boyfriend by Justin Bieber runs 435 notes across 39 bars, 2:31 long in Gb at 98 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? Boyfriend chords and lyrics.