Kierkengard was Ethical.

Even though he never considered himself ethical, he was in that stage of life. By not acting on his feelings of love and realizing he was not mature enough to have a relationship, he made an ethical decision. Even though it is claimed that choices are aesthetic he made a decision which lead him to despair. Despair is the "mark' of the shift into the ethical stage of life. He was in despair because he knew his lover would never again be his and was lost forever.