What is the ruling on someone who sought guidance from Allah (istikharah), then told a woman of his love for her, and they agreed to marry, but then she severed the relationship after the agreement?

Acquaintance between non-mahram (definition) men and women and the love relationship between them is not sanctioned by Islamic law, as it is a gateway to tribulation and corruption. Marriage is the ideal solution for a man's heart to be attached to a woman, as the Messenger of Allah, peace and blessings be upon him, said: "We have not seen for two who love one another anything like marriage." If a man is unable to marry the one he loves, then he must fear Allah and turn his heart away from her. Istikhara (seeking guidance from Allah) is permissible when contemplating a permissible matter, so that the servant may entrust his Lord with choosing what is best for him.