Is the relationship that brings together a Muslim young man and woman online, which includes the exchange of religious and linguistic information within a framework of mutual love, considered Haram (forbidden) in Islamic law, and what is the optimal course of action if it is, especially considering the psychological state of the young man?

A woman's conversation with a non-mahram (definition) man is not permissible except out of necessity and with adherence to Sharia (definition) guidelines. The extensive conversation that occurred between you two, and each of you expressing love and admiration for the other, is not permissible in Islam. A man should invite a man, and a woman should invite a woman; this is safer and further removed from temptation. You must repent to Allah and sever your relationship with him. It is sufficient to direct him to communicate with reliable Islamic organizations and trusted Islamic websites.