Is the young man's return to his country and his guidance, subsequent to the girl's prayer for him to marry her, considered an indication that Allah will unite them in a lawful marriage?

Allah commanded us to supplicate and promised to answer, and supplication is worship. Allah loves those who persist in it. Whoever supplicates to Allah with sincerity, fulfills the conditions, and removes the impediments, his supplication will be answered either in this world, or its reward will be stored for him in the Hereafter, or an equivalent amount of evil will be averted from him. Allah may choose to store the reward or avert evil due to a wisdom He knows, for He knows that good lies in withholding. Continue to supplicate for marriage to this young man. If it is good for you, Allah will answer it, and if diverting it is better, He will divert it. Be content with what Allah chooses. It cannot be affirmed that the young man's guidance necessarily means marriage, as this is part of the knowledge of the unseen.