Because it was the capital of romanticism

At the end of the 18th century, a new artistic movement called romanticism is expanding throughout Europe, and has an important influence in France. Paris then becomes the home of many romantic writers and poets, who give priority in their works to feelings, and of course, to love. This influence of love on artistic creation in Paris has continued since then, even beyond the romantic current.

Because it is full of romantic places
Paris is one of the most beautiful cities in the world. If, like me, you have had the opportunity to visit its streets, its neighborhoods, its parks or the banks of the river you know what I mean. Not only are the monuments, nor the architecture in general. It is a city with a soul, full of precious corners.

The most romantic experiences in Paris
Paris is a city with a wide range of activities, museums, concerts, and more, but if your idea is to enjoy a romantic moment with your partner, you may want to opt for some of those experiences:

A dinner on the Seine. The night views of Paris from the river are stunning. It is that many of the emblematic monuments of the city are at the edge of the Seine, such as the Cathedral, the Louvre, the Eiffel Tower, etc ... Therefore, dine in one of the boats that go along the river, like those of the company of Bateaux Mouches can be a wonderful experience, both for the views and the palate.
A walk through Montmartre. The neighborhood of the hill that culminates the Sacred Heart was famous before the movie Amélie, since it is a place full of charm, and walking through its steep streets is quite an experience. And since you're there, you can admire the "I love you" wall in Jehan Rictus Square.