"I Warned Myself" is a pop song by American singer Charlie Puth. The song was released through Artist Partner Group and Atlantic Records on August 21, 2019. It was co-written and produced by Puth with Benny Blanco.
On October 1, 2018, Puth announced that he was working on a new album. He first hinted at the title of the track on August 10, 2019 on his Instagram with the caption "i Warned Myself this would happen". A week later, he officially announced the release date and posted the cover art of the song. The song marks the first of three single releases. Puth revealed that the song is about "a vicious cycle of going back to someone continuously, knowing deep down that they aren't any good for you".