Taylor Swift was 'really bitter' about John Mayer at the ACM Awards

Taylor Swift performed at the Academy of Country Music Awards back on April 7, as did ex-boyfriend John Mayer, and sources are now revealing that Swift was not pleased with the situation.

Swift, 23, and Mayer, 35, dated for a short time in 2010, with Swift writing her infamous song "Dear John" about him after the breakup. Of the song, Mayer stated, It made me feel terrible. Because I didnt deserve it. Im pretty good at taking accountability now, and I never did anything to deserve that. It was a really lousy thing for her to do.

Apparently there are still hard feelings present on Swift's end. According to Us Weekly, Mayer was scheduled to perform first at the ACM's, prompting Swift to put on "a stink," insisting that "she had to go on earlier than him," a source revealed.

Swift ultimately got her way, but "was just really bitter that night," another source adding, "John just being there irked her."

image: MTV/image.net