Obsessive love

I think Scottie's condition is obsessive love. Hitchcock liked to take a trait that we all share and push it into a darker realm. New love or infatuation has elements of obsessive love. We project all our happiness and dreams onto that person. It would seem that we have been waiting for them to "complete us". Hitchcock feels the end result is that people try to change and control people to be the person they initially fantasized about. Scottie did not love Madeline or Judy, he merely wanted to manipulate and control them to fulfill his obsessive love that he had for them.