Life & Style has exclusively learned that Miley Cyrus canceled her wedding to Liam Hemsworth — and it has a lot to do with their differing personalities.

"He can't keep up with her," an insider says of the 26-year-old actor, "and she's been finding life with him to be a snoozefest."

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One of the things the duo clashes over is the 23-year-old singer's pot smoking, and a recent fight about it left Miley in tears.

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Throwing it WAY back… what a 'blur.' #TBT

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"She was screaming at him, telling him he was holding her back and making her hide who she truly is," a friend shares. "They are still both so upset and angry."

For more on the couple’s crumbling relationship, pick up the latest issue of Life & Style, on newsstands now! And scroll through the gallery below for a look at the pair’s cutest quotes about each other.