The wife found out that her husband cheated on her, and decided to take revenge on him in the same way. The husband went into the bathroom, and saw his wife during treason. She directly told her husband that she would take revenge on him for his betrayal. Therefore, the wife is aware of the cheating on her wife and also decided to do with him. All this is understandable in dialogues that are translated into Russian. Now the wife has a full right to fuck with other men.