Cantarella/Sasha
As far as secondary romance options go in The Witcher 3, Carthia van Canten, aka Cantarella, takes the cake in having one of the most heist-film love stories to ever grace a video game. After meeting her under her pseudonym, Sasha, you have the option to indulge her by entering a tournament where the two of you plan on splitting your winnings. Hijinks ensue, and now you guys are smack dab in the middle of your own medieval heist romance. How serendipitous.
If you romanced Cantarella, you like the kind of person who has an air of mystery to them, but you still want someone considerate despite your short-lived romantic entanglement.