Is expiation incumbent upon breaking a vow made to Allah not to add males online, then adding and deleting them, then adding them again?

In summary, a mere promise is neither an oath (yamin) nor a vow (nadhr). Fulfillment of a promise is sought, especially if it is between a servant and their Lord. Breaking a promise is a characteristic of hypocrites. However, if it was due to forgetfulness, then there is no blame, as the Prophet, peace and blessings be upon him, said: "Indeed, Allah has forgiven my nation for their mistakes and forgetfulness." There is no expiation required for what you did, and you should be cautious about communicating with non-mahram men unnecessarily.