Tomodachi life auto friend help

ok so i came across my game and decided to play it after months and i tried to get 2 mii's together (Dipper & Wendy from gravity falls idc about any hate comments & i got them together) and Wendys only friend was Dipper so it was working out well until she met 2 of Dippers friends when my 3ds was off and the same thing has been happening to my