John Mayer reportedly sent Katy Perry an email to end their whirlwind romance. According to Us Weekly, Mayer was tired of Katy's partying ways and decided to end it. A source said, "He dumped her over email. She was furious and really hurt. She was into him, but he wasn't feeling it. John did a real number on Katy. She held off from his advances for the longest time, but he laid on the charm thick and promised her he was a changed man. She eventually gave in, fell head over heels for him and then - yep - once he had made his conquest, he dumped her."