Since this story is very deeply written in psychology, it is very difficult NOT to sympathize with the characters.
This particular guy is a fantastically unhappy person, and I sincerely feel sorry for him. Yes, his methods were super-bastardly, yes, he did stupid things. But I still feel sorry for him - everyone wants to be loved. Loved just like that, for nothing. Without conditions. And I always feel terribly sorry for lonely people who were never able to receive such love.
Okay, now their misunderstanding is starting to kill me slowly.