Songbird Jessica Simpson’s marriage to Eric Johnson has reportedly hit a rough patch, RadarOnline.com has learned. Insiders sparked new fears about the couple’s nearly ten-year marriage after claiming the singer and her husband are secretly living separate lives. “Eric has been doing his own thing for longer than anyone seems to know — well over a year now,” a tipster dished to the National Enquirer. “He’s been very vocal about how difficult it is to live with someone so obsessed with surgery and so detached from reality most of the time.” Never miss a story — sign up for the RadarOnline.com n…