Katy Perry and John Mayer have once again said goodbye -- for now. The Katy Perry and John Mayer, have split for the second time, multiple sources. The high-profile pair began casually dating during summer 2012, and briefly called it quits back in August before reconciling the next month.

“It’s sad,” one pal told. “It’s not over until it’s over. You have to see how things play out.”

Another source added, “She’s leaving the window open. They have both been so focused on work.”