Stabbed in the Back
Definition:Betrayed
John: Andy, what have you done?
Andy: what do you mean?
John: I mean the house. I showed you that really cheap house that I was going to buy, and now when I went to buy it today, someone had already bought it. You were the only one who knew about it.
Andy: Listen, I haven’t broken the law. Anyone can buy a house if they have the money.
John: That’s not the point. You knew that I wanted to buy it but you bought it anyway. Stabbed in the back by my own brother!