It's been almost six months since Russell Brand filed for divorce from Katy Perry and the pop star has largely been quiet on why things didn't work out. Until now.

In her new movie Part of Me, Perry, 27, pulls back the curtain to discuss why her marriage with Brand, 37, fell apart.

The biggest strain on their relationship, she reveals, was her busy touring schedule. As scenes in the movie show, Perry used days off from her grueling world tour to take side trips to see Brand. Yet the time apart still took its toll.

In one scene, Perry is seen sobbing uncontrollably backstage – minutes before show time. Eventually, she rallies. "Start time," she says before hitting the stage.

Perry also hints that her rocketing music career was a source of tension between her and Brand. "I thought to myself, 'When I find that person that's going to be my life partner, I won't ever have to choose [between the partner and my career] … they won't be threatened or have weird motives," Perry says. "Then I started to realize, that's not true. That fairytale I had is not true for me right now."

The pop star says she did everything she could to save her marriage. "I have that same belief system with everything, from career to my life to my personal life, everything. And I will do everything it takes to not fail. And I did everything it took but it still failed."

Paramount's Part of Me opens July 5.

滬江娛樂快訊：離婚半年來(lái)，凱蒂·佩里一直不愿多談這段婚姻失敗的原因，這次“水果姐”終于開口了！在她7月即將上映的3D紀(jì)錄片"Part of Me"中，凱蒂透露自己繁忙的事業(yè)是導(dǎo)致兩人婚姻失敗的重要原因。為了維系婚姻，凱蒂總是會(huì)在忙碌的世界巡演中抽出時(shí)間看望丈夫，可惜這樣聚少離多的日子終究無(wú)法長(zhǎng)久?！拔易隽四茏龅囊磺?，可是最終還是失敗了”。

這部展示凱蒂生活的3D巡演紀(jì)錄片"Katy Perry：Part of Me"將于今年7月5日正式上映，讓我們一起期待吧！