A method for managing text messages of a chat between a user and a contact of an instant messaging application that provides the option to apply a secret chat mode on the messages that are written or recorded and displayed in the dialog boxes after applying the secret mode. The method indicates on the screens of the computing devices of the user and the contact that the chat is under the secret chat mode. The method deletes from the dialog boxes the text messages that are under the secret chat mode upon receiving a deleting command from the user or the contact. The deleting command may be automatically created when the user or the contact leaves the chat. The method stores these text messages and re-posts them upon receiving a mutual re-posting command from both the user and the contact.