Katy Perry on Russell Brand Split: I Tried as Hard as I Could ...

Sometimes it just doesn't work out.

That's the bottom line when it comes to Katy Perry's marriage to Russell Brand, she says in her new documentary, Katy Perry: Part of Me, which chronicles the many highs and lows in Katy's personal life as well as her stage persona.

"Being in love is a dream, but the reality is not like the movies. There's a lot more compromise and sacrifice," says Perry, and she knows from experience.

Prior to their split, Perry informed her management that the longest she would go without seeing Brand was two weeks; it didn't always turn out that way.

At one point, a frustrated Perry learned she'd go 18 days without him. "Where are my relationship days?" she asked, looking at her jam-packed schedule.

The constant traveling took its tool even when she had them. "She'll fly to wherever Russell is," a team member said. "She's running herself ragged."

One scene from the film shows Katy Perry without makeup on an airplane, looking into camera and admitting: "I'm trying to keep my marriage alive."

After Brand filed for divorce in December, Perry was visibly and understandably upset. "The truth is I'm a romantic and I believed in the fairy tale."

"I did everything I could but it still failed," the "Wide Awake" singer said. "The dream of being in love is a lot different than the reality of making it work."

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