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Katy Perry has been frustrated amid her 143 album release

The singer was "very stressed" over the reception her new music received, a source says, which caused "some tension" in her relationship with fiancé Orlando Bloom

"Orlando was understanding," a second source tells PEOPLE

Katy Perry and Orlando Bloom 's relationship experienced strain amid the singer's latest endeavor.

An insider tells PEOPLE, "Katy was deeply frustrated following the lackluster [reception] of her new album," 143 , which came out in September . "It made her very stressed. Orlando was understanding, but it did cause some tension."

A second source adds, "This was supposed to be Katy’s big comeback. She was excited. It’s been devastating to watch it fall flat. She's disappointed in the tour r

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