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A source tells E! News exclusively that this may not be a permanent split, and that once things calm down with their schedules, they could get back together.
"They both really love each other," our insider says. "They've always been hot and cold and on and off."
The source informed E! News on Wednesday that Perry's upcoming world tour was a big issue for her and Mayer, saying the "Dark Horse" singer was definitely putting her work first, but adding that it's unclear whether or not her tour was the actual final straw.