This character has gone "Psycho" long before he says, "She might have fooled me, but she didn't fool my mother"
[DOC] [TLE] Psycho (1998) - Quotes - IMDb [PAR] Psycho (1998) Quotes on IMDb: Memorable quotes and exchanges from movies, 
... And because he was so pathologically jealous of her, he assumed that she 
was ...