02/09/2011 01:54 pm ET Updated May 25, 2011

Why Ashlee Simpson & Pete Wentz Split

Don't expect a bitter fallout between Pete Wentz and Ashlee Simpson-Wentz, who filed for divorce Tuesday after two and a half years of marriage.

"It's very amicable. They're on very friendly terms and speaking -- it's fine," a source close to the couple tells PEOPLE. "They've just grown apart. They've been growing apart for quite some time."

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