John Mayer has finally revealed what caused him to say stupid things about his ex-girlfriends in interviews.

"I was just a jerk," the singer admitted in a sit-down with CBS Sunday Morning, set to air on Sunday.

John, who's currently dating Katy Perry, made headlines in 2010 when he referred to his ex Jessica Simpson as "sexual napalm" in a Playboy interview. His other exes include Taylor Swift, Jennifer Aniston, Jennifer Love Hewitt and Minka Kelly.

John is recovering from vocal-cord surgery and says he's looking to turn over a new leaf as he prepares to return to the stage for the first time in two years. In the interview, he said, "It's very liberating when you finally realize it's impossible to make everyone like you. I wanted everybody to like me. I thought I was one shuck and jive away in every direction."

SOURCE: Us Magazine