Is a fiancée's online conversation with young men considered "betrayal" to her fiancé, even if the conversations are very ordinary, and the marriage contract has not yet been concluded?

A woman's conversation with a man via chat rooms is a reprehensible act and a betrayal of Allah and His Messenger, for Allah Almighty says: "O you who have believed, do not betray Allah and the Messenger or betray your trusts while you know [the consequence]." Repentance from this is obligatory, and these chats must be abandoned, as leniency in them can lead to dire consequences. Describing a betrothed woman's conversation with non-mahram men as a betrayal of her fiancé is an unacceptable description, because it gives the impression that these forbidden acts are only deemed detestable because they are a betrayal of the fiancé, and this is a concept contrary to Islamic law.