Photo Credit: @LoveIslandUSA / YouTube The Emmy-nominated host Ariana Madix has one big rule as the host of Love Island USA. The rule is: the Islanders cannot know what she knows. The Islanders may try to decode every smile and reaction, but Madix has learned to keep her secrets locked down. Ariana Madix reveals why she had to keep Love Island USA footage hidden from the Islanders As Vulture covers, Madix said she never gives the Islanders clues…