Scarlett Johansson Broke up Justin Timberlake and Cameron Diaz

US Weekly claims that Justin Timberlake and ex-girlfriend Cameron Diaz split up because Justin wanted Scarlett Johansson to be in his new music video, even though he knew she ‘wanted’ him, much to the dis-approval of Cameron.

“Scarlett has always liked Justin. They’ve always had a flirtation - that’s why Cameron was threatened by her.” With good reason. The decision to cast the 20-year-old as the video vixen pushed Timberlake’s relationship with Diaz to the breaking point, and paved the way for Johansson to move in for the kill. “She could not believe he went behind her back to put her in the video,” says a Timberlake pal. “Cameron was very jealous of Scarlett.” Adds the source, “they definitely got together after she did the video.”

If this is true, then basically its saying that Cameron didnt trust Justin, and they probably had some huge argument over something as little as this, maybe it had been coming for sometime?