That's being two-faced. She passed herself off as a friend. He sees a bizarre trend coming from this. They'll have to have bugged and bug-free rooms,'' he said. And he was only half-kidding.
False friends come in many sizes.
They can get you drunk and drive off with your car. They can kiss and tell. They can spend your money till you're broke. They can ruin your life. True friends would rather die than do anything like that.