Okay basically there's an issue with choosing Darius when it gets to the point with the Bara Godmother in the first day it narrows it down to Darius, but then he disappears and Spencer appears and sends you through his route.
Chances are, your choices while with Darius aren't really earning you any points with him. Spencer is the route it defaults to when you don't earn enough points with anyone else. Understandably confusing, so it'll be something for me to think about fixing!