What great disappointment does Schliemann suffer in the year 1848 as noted in the biography, The Walls of Windy Troy?

Of all the stumbling blocks in Schliemann's life, it is his personal life that at first troubles him the most. He works hard to make his fortune, sustained by the thought that someday he will marry Minna, a childhood friend with whom he once shared the dream of finding Troy. But when in 1848, at the age of twenty-six, he finally feels capable of supporting a wife and writes a letter of proposal to Minna, he learns that she has married someone else. It seems typical of Schliemann's singlemindedness that he could go for so long assuming so much about a woman whom he has not contacted in years.