Jennifer Lopez and Ben Affleck’s crumbling marriage continues to be a rollercoaster. According to insiders, the ‘Get Right” singer, 54, was not thrilled her husband, 51, swiftly moved his belongings out of their newly listed $60 million mansion as rumors continue to swirl about the possible end of their romance. “Jen was horrified when she came back and found out Ben had packed everything up while she was gone,” the source spilled about Lopez’s return from her solo trip to Europe, adding that the removal of the items seemed like a “very cold, like a military operation.” “As far as she’s concer…