The recently announced split between singers Jennifer Lopez and Marc Anthony—which many suspect was hinted at heavily in J-Lo’s last album—has left their fans in shock. But what exactly went down between Leo Sun (surprise!), Scorpio Moon Lopez and Virgo Sun, Cancer Moon Anthony? Did the self-obsessed, jealous sexual energy of Lopez wound Marc Anthony’s overly detail-oriented and sensitive nature?

Recent details suggest that Lopez continually suspected Anthony of infidelity (Scorpio paranoia), apparently leading to their split. But did he actually cheat?

People Magazine reports:

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.

What do you think—what actually caused the breakup? Is it likely that Marc Anthony actually was unfaithful, or more likely that J-Lo’s self-obsessed, jealous and controlling nature caused her to see something that just wasn’t there?