Moore landed a $2million book deal with HarperCollins before the breakdown of her six-year marriage to Kutcher, after he allegedly slept with 22-year-old Sara Leal on the weekend of their wedding anniversary this autumn.
According to In Touch magazine, the Two And A Half Men star is worried that she might include private details about their time together.
“She got the book deal when they were still together, and it was supposed to focus on her childhood, her complex relationship with her mum and how it affected her life and career, including her addiction and recovery,” said a source. “He’s afraid she’ll ruin his image by exposing all of their secrets.”