Erotic love and marriage are really just a deeper corroboration of self-love, with two people involved in self-love. That is exactly why married people become so content, prosper so vegetatively for pure love is not adapted to worldly life in the way self-love is. The lonely person therefore lacks self-love, which married people express by saying that person is selfish, since married people assume that marriage is love.
Self-Love 47 VIII I A I90 - S. Kierkegaard.