This is an easy guitar lesson aimed at the relative beginner. To play this song using easy chords you must have a Capo on the 4th fret.
Puth teased the song in September 2017 on social media. He tweeted two photos in a row, which were captioned “how” and “long” respectively. In October 2017, he posted photos and video clips with the captions, “has”, “this”, “been” and “going”. On October 4, 2017, he posted a video of the voice note recording behind the song with the caption “on”, eventually spelling out “how long has this been going on”
As of November 1st 2017 the song has already been viewed by 52 million people.