Twain and Lange in London in 2000
05/16/2008 at 02:00 PM EDT
Robert "Mutt" Lange tells PEOPLE exclusively that his split from Shania Twain is "unfortunate."
"It's just an unfortunate thing that's happened," Lange told PEOPLE shortly after the couple's separation was announced
Thursday. "It's literally just a growing apart, that's all."
A source close to Twain also tells PEOPLE that the singer didn't expect the split. "She's devastated," another source says. "She's getting through it with a very close-knit group of family and friends."
Twain, 42, and Lange, 59, married after a six-month courtship in 1993. They have a 6-year-old son, Eja D'Angelo.
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