Jennifer Lopez and Marc Anthony
07/20/2011 at 12:00 PM EDT
When they announced their split
on July 15, Jennifer Lopez
and Marc Anthony revealed they had already "come to an amicable conclusion on all matters."
For those who know the couple, that statement might have been more surprising than calling an end to their seven-year marriage.
The decision to split actually came "after months of nonstop arguing
," says a source close to the family. There were issues on a movie set, envy on the American Idol
stage, and times that Lopez, 41, feared her husband wasn't faithful.
An Anthony insider disputes infidelity claims and maintains the 42-year-old always supported her career. "They started to see life differently," the source says.
As they move on to the next chapters of their lives, the Anthony insider also says the breakup is for the best. "Though they love, admire and respect each other very much, they just needed to be apart."
For more on what tore the couple apart – and what will happen to their kids and multi-million dollar homes – pick up this week's issue of PEOPLE, on newsstands Friday