"Rich" is a song about the idea of wealth and happiness in a relationship. The singer wonders if having lots of money and material possessions would make him and his partner happy, or if they would still cherish the simple things in life like spending time together and enjoying each other's company. He reassures his partner that even if he never becomes rich, he will always treasure the time they spend together as the most valuable thing he can give. The song emphasizes that true wealth comes from love and companionship, rather than money. Ultimately, the singer expresses optimism that he and his partner will be "rich" in the most meaningful sense of the word, and celebrates their relationship with a fun, upbeat melody.