John Mayer, who is presently dating singer Katy Perry, finally admits to being a jerk to Taylor Swift while the two of them were dating.

According to a report from Hollywood Life , Mayer opens up in a new interview to air on CBS Sunday on February 10th, about his treatment of the “I Knew You Were Trouble” singer and his reason behind it.

“I was just a jerk,” he admits.

The “Shadow Days” singer says his “womanizing attitude” came from a desperate need for acceptance.

The two dated back in early 2012, and is chronicled in Taylor Swift’s song “Dear John,” which appears on her Speak Now album.

She minces no words on the track.

“Dear John, I see it all now it was wrong/Don’t you think nineteen’s too young/To be played by your dark, twisted games/When I loved you so, ¶ should’ve known,” the lyrics read.