Throw over
Definition 1 of 2
Pro Tip 1/3Relationship Decisions
Used when someone leaves a relationship for someone else. 
After years of unhappiness, she threw over her boyfriend for a new love.
Pro Tip 2/3Career Changes
Ideal for describing a sudden or significant job or career switch. 
He threw over his corporate career to start his own business.
Pro Tip 3/3Choice Consequences
Emphasizes that 'throw over' entails a definitive choice with impact. 
Choosing the city life, she threw over her small-town roots.