These doubts became so intense that in 1912 the two stopped corresponding, and in 1914 they completely terminated their relationship—despite the fact that Freud had earlier nominated Jung to be the first president of the International Psychoanalytic Association. The break in the relationship was especially disturbing to Jung, who entered what he called his “darkyears,” a periodofthree years duringwhich hewassodepressedhecouldnotevenreadascientific book. During this time, he analyzed his innermost thoughts and developed his own distinct theory of personality, which differed markedly from Freud’s. Jung continued to develop his theory until his death on June 6, 1961.