The love of money is the most prevalent in the novel. It shows how shallow and immoral the rich can be. Physical attraction isn't love, but it's used in the book. Gatsby's obsessive love for Daisy is shown throughout, especially when he buys a house across from hers. For the most part, the love shown in the novel is unhealthy and sick. Some have an illusion of what love is, while others show their "love" in an abusive way or by having affairs with others outside of marriage. Does Gatsby really love Daisy, or is he in love with what she represents? I don't know that any of the characters, except maybe for Nick Carraway, have any idea of what love is.