What is the ruling of Islamic law on falling in love with a foreign man online due to a wife's feeling of emotional emptiness and neglect from her husband, and what is your advice to this wife?

Supplication is among the most important matters, coupled with certainty and good hope. The husband must treat his wife kindly, following the example of the Messenger of Allah, peace and blessings be upon him. The husband's harshness, severe temperament, and humiliation of his wife are considered poor treatment and a dereliction of her rights. However, this does not justify establishing a relationship with another man, as it is a grave sin, especially if the wife is under the marital bond of a man. This relationship must be ended immediately, and repentance offered to Allah the Almighty. Sincerity in repentance, by Allah's grace, cures passionate love. It is advisable to fill one's time with beneficial activities, associate with righteous women, and may Allah facilitate the memorization of the Quran, even online if attending memorization centers is difficult.