how could you
An expression of shock, dismay, and displeasure over another's actions. How could you forget our anniversary? We've only been married a year! So you told the boss about my personal struggles to get ahead. Wow, how could you?
How could you (do something)?
How could you bring yourself to do a thing like that? (No answer is expected.) Looking first at the broken lamp and then at the cat, Mary shouted, "How could you do that?" Tom: Then I punched him in the nose. Rachel: Oh, how could you?
how ˈcan/ˈcould you!
(spoken) used to show that you strongly disapprove of somebody’s behaviour or are very surprised by it: Ben! How could you? After all they’ve done for us!Ugh! How can you eat that stuff?