First, romance requires concentration. Concentration is focus focusing on the beloved, be it a hobby, a place or a person. A romantic pays attention and gives attention. Le Petit Prince chooses and waters his rose, he focuses on it. It is his rose.
Concentration calls for loyalty and faithfulness.
A romantic will return again and again to a place she or he has chosen, finding more there than before, new sights, smells and sounds with each visit. Second, romance requires pursuit. A consummately romantic figure is the baggy suited professorial bespeckled man with a butterfly net in his hand, reaching skyward, in hot pursuit of his delicate and elusive prey. A romantic is always on a search. Collectors are all romantics, searching for the one missing element in their collection for one more Pez container or cookie jar or for one more Picasso or perhaps one stamp from a country no longer in existence.