The couple ended things last summer before reuniting the following month.
The fireworks are over between Katy Perry and John Mayer.
The couple began dating in summer 2012 but have called it quits, according to Us Weekly.
"It's sad," says a source, adding that they could still reconcile. "It's not over until it's over. You have to see how things play out."
So, what went wrong this time?
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