Star magazine reports the lovebirds have been bumping heads while on tour in Canada because Simpson is homesick and misses her friends.
Sources say Mayer cant stand Simpson going to clubs to hang out with her posse back in Los Angeles, and gets mad when she wears cleavage-baring dresses.
Mayer is also upset about Simpsons Friday (May 4) night performance with the Pussycat Dolls.
Says a source: I believe John asked Jess to think about what was more important to her partying or their relationship.
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