Romance requires effort
Romance does not come naturally to most people, but many people still partake in romantic acts.
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The vast majority of people in relationships find it difficult to include romance on a regular basis.
Romantic love, while not a natural feeling or expression, has become real because people enjoy the idea of romance. Just like how making music takes time, effort, purpose, and practice, romance takes effort and purpose to put into practice for those we care about. Once we put romance into practice enough, it becomes second nature in relationships. We as intelligent beings can practice romance in any of our relationships in the same way music might come naturally to someone who devotes all of their time and energy into mastering it.
Humans are romantic because we feel like being that way.