Someone suffering from OPD becomes angry when their other half so much as looks at someone of the opposite sex.
=Boyfriend glances at random woman across the room=
Girlfriend: What, am i not good enough for you anymore? You have to go checking out other girls?
Boyfriend: No hun, i was just looking at her bright purple hair..
Girlfriend: So how long has this been going on???
Boyfriend: Calm down babe...
Girlfriend: WE ARE SO OVER! I WILL NOT BE CHEATED ON BY SCUM LIKE YOU