Lewis wrote a book called The Four Loves. Benedict XVI wrote his first encyclical on "God is love". He said that a human being, created in the image of God, who is love, is able to practice love; to give himself to God and others (agape) and by receiving and experiencing God's love in contemplation (eros).
Similarly one may ask, who invented the word love?
Ancient Greek had four distinct words for what we translate as "love." Agápe (?γάπη agápē) means "love," such as in the term s'agapo (Σ'αγαπώ), which means "I love you." In Ancient Greek, it often refers to a general affection or deeper sense of "true love" rather than the attraction suggested by "eros."
What is love and romance?
Romantic love is a relative term, but generally accepted as a definition that distinguishes moments and situations within intimate relationships to an individual as contributing to a significant relationship connection. The addition of drama to relationships of close, deep and strong love.