:) Practicality differs from theory... Girls are not stupid, but it is just that manipulating is easier... Thought process runs, but when someone impresses you when you are shunned by others, that creates an impression... Notice turns to like turning to love... And love blinds you!
As for Neha... Opposites attract is the only word I can use... Ajay is the super cool dude kind of a guy, any girl would want to go on a date with... his impressive attitudes spell them for him... Maybe her yearn that she was never considered by him for a date, led to her thinking about him more and that made her fall in love with him!