the bubble bursts - a very happy or successful period of time suddenly ends.
Their first argument burst the bubble.
idiomburst the bubble(also prick the bubble BrE)to do something that ends a happy or successful situation or that destroys someone's happiness or hopes:The Sharks went into the game with confidence, but the Penguins burst the bubble by beating them 5-3.Cathy refused to let Edward's bad mood prick the bubble of happiness.