Somebody that feels guilty about something in/from their past.
His/her saint complex was a way for him/her to convince himself/herself that he/she had nothing to hide from anybody.
When someone who judges others based off of their misdeeds, but chooses to ignore their own misdeeds & the good deeds of those being judged.
It allows the Judge to be arrogant to Judge others without facing trial or judgement for their own mishaps or mistakes.
He's got a Saint Complex. You forget the thousand incidents with that guy?