After a year and a half together, Lauren ?Lo? Bosworth and beau Scott Hochstadt have called it quits, an insider tells In Touch. ?It is over for good,? a pal says, ?but they have no bad feelings about each other. They both agree it?s for the best.? The couple?s busy lives seem to be the cause of the sudden split, which occurred on December 13. While Scott owns lacrosse and music touring company LXM PRO, former The Hills starlet Lo?s dating advice book, The Lo Down, will be released in January. ?Both of their careers are taking off right now,? the pal explains. Despite remaining on good terms with her ex, the normally peppy reality star is understandably feeling down. "Lo is pretty sad," says the pal. A rep for Lo confirms the breakup.