Kevin Federline thinks his ex-wife, Britney Spears , is “racing toward” a tragic ending with her erratic behavior.

“The truth is, this situation with Britney feels like it’s racing toward something irreversible,” the former backup dancer writes in his forthcoming memoir, “ You Thought You Knew ,” per the New York Times .

“It’s become impossible to pretend everything’s OK,” Federline, who shares sons Sean Preston, 20, and Jayden James, 19 , with the pop star, adds.

“From where I sit, the clock is ticking, and we’re getting close to the 11th hour. Something bad is going to happen if things don’t change, and my biggest fear is that our sons will be left holding the pieces.”

Federline, 47, goes on to recall a time when his sons told him they did not want to go back to their mother’

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