It's not okay to spy on others or be sneaky.
AJ is worried that his girlfriend Susan is cheating on him.
AJ wants to find if Susan is cheating.
AJ asks Susan directly if she has been cheating on him.
AJ spies on Susan whenever she goes out in public.
Susan answers honestly that she has never cheated on AJ.
Susan catches AJ and breaks up with him for his lack of trust.