for the first two, you need to follow Skylar's route
when you discuss with Skylar about your relationship concerning Jessica, you have to choose between pursuing your relationship or stop it, after that the game sends you into one of these two routes
you probably already have the scenes with Jessica so try pursuing your relationship with skylar (these scenes are during your date with her and the choice i mentioned is in ep3 i think)
then for the last scene, i'm actually not sure, you just need to follow Darci's route if i'm not mistake, you should check the online guide