It depends on what you consider "romantic."
The qualities associated with the Earth element, such as groundedness and perseverance, are reflected in the Knight of Pentacles. He expresses his feelings slowly and often through practical actions. While he might not be overtly romantic in the traditional sense, his commitment and reliability can be seen as romantic qualities.
This knight is known for sticking by his partner through thick and thin, displaying a deep commitment. However, his slow and methodical approach can be frustrating for some. Personally, I find these qualities romantic, but some may wish for a bit more spontaneity.
In reverse, the Knight of Pentacles may indicate being stuck or a lack of forward action.