Lauren Alaina and Kane Brown‘s friendship goes all the way back to middle school. Brown was the new kid at Lakeview Middle School in Fort Oglethorpe, Ga., and just happened to get seated next to Alaina. Their friendship blossomed as their respective music careers took root, and when they both made it to Nashville, they cut a chart-topping duet together in 2016, “What Ifs.” They’re good friends to this day, but when Alaina married Cam Arnold on Feb. 4, Brown was nowhere to be seen. He was a guest on the Big D & Bubba radio show this week and revealed why he really couldn’t make it to the weddin…