Originally appeared on E! Online

Kevin Federline is concerned that Britney Spears is not getting stronger.

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The DJ — who was married to the “Sometimes” singer from 2004 to 2007 and shares sons Sean Preston Federline , 20, and Jayden James Federline , 19 — writes in his upcoming memoir "You Thought You Knew" (out Oct. 21) that he is concerned for his ex’s health and well being.

“The truth is, this situation with Britney feels like it’s racing toward something irreversible,” Federline writes in the memoir, per an excerpt published in The New York Times Oct. 14. “It’s become impossible to pretend everything’s OK.”

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The 47-year-old added, “From wher

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