"He needed to get away from Los Angeles and spend some time with his brother and friends," a source said.
"They have broken up before, and are broken up again now. There was drama because she suspected he had a wandering eye. And she recently tweeted a denial that he cheated.
"While Miley has insisted they are still together, right now they are very, very much apart.
"Miley is a fiery character, and they do fight, but she is crazy about Liam. She isn't ready to accept it might be over for good."
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