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Ben Stiller is opening up about why he felt like he was "failing" following his separation from his wife.

In his new documentary, "Stiller & Meara: Nothing Is Lost," the 59-year-old "Zoolander" star explores his parents’ decades-long partnership, comparing it to his own marriage with Christine Taylor.

Ben and Taylor married in 2000 and announced their separation in May 2017 after 17 years together.

"When we separated, my feeling was like ‘Oh, I’m failing at this’ and look at my parents. They have this incredible 50-plus year marriage and I can’t live up to that," he tells Taylor in the documentary, per People .

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The documentary follows the

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