What Went Wrong for Pete Wentz & Ashlee Simpson-Wentz?

Sources say it was long distance -- not cheating -- that put a strain on their marriage

After less than three years of marriage, Ashlee Simpson-Wentz filed for divorce from husband Pete Wentz on Tuesday. But what came between these two young stars, who started off as best friends?

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

Right now, the couple is concentrating on the effect their split will have their 2-year-old son.

"It's all about Bronx for them. They're fantastic parents -- Pete says she's a great mom, and she says he's a great father," says the source. "It's about Bronx's care and well-being and happiness for them."

Friends say that neither Simpson, 26, nor Wentz, 31, were cheating. Wentz has been touring with his new band Black Cards and the distance is just adding to the space that has already formed between them.

"They're both really sad. It's a sad ending to something that was really promising," says the source. "They're each trying to figure out what this transition is going to be like."

Were you surprised to hear about the breakup of Pete Wentz and Ashlee Simpson-Wentz? Chime in below!

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