You believe? Based on what? This is senstive topic for would-be and current grad students and this is def not the time for you to throw out all your anecdotes about this guy that you knew that one time and/or other speculations you might have about divorce rates. If you know of some professional survey that demonstrates that stat for psychologists (its obvioulsy not the norm in the gen pop), then cite it. If not, keep your mouth shut about it.