Hilariously shown in an episode where Sonny and Tawni's date Hayden kiss at a basketball game — because they are both shown on the "kiss-cam" and they do it to ease the nagging audience — and Chad finds out.
Chad: [to Sonny] Who is this guy?! Tawni: The love of my life! Chad: THEN WHY IS SHE KISSING HIM?! Tawni: I DON'T KNOW!
Disproportionate Retribution: When she finds out Sonny and Chad are in love, she sets out to ruin her career, reputation, and relationships and plots to assassinate her. When everyone finds out of her plans she still expects Chad to like her. When he rejects her, she leaves them die on an abandoned airplane.