I don’t know if you are genuinely confused, or wanted me to think this question over given the new love rules the trolls have, but this is what I think.

From what was explained, Kanaya loves Vriska. Or HEART Vriska. She tried to cnvince herself and others (Darth Fish) that is was DIAMONDS feelings to her. But Darth Fish called her out on her HEARTING Vriska. He wanted her to be the auspistice for Team Fish, but she refused because she didn’t want that because of her confusion for Vriska. But then she saw Vriska being HEART and SPADE to Tavros, by using a thing that Vriska asked Kanaya to make (the dress).

So it was like Kanaya was crying not only for not getting HEART back from Vriska, but also being trapped in a CLUB relationship as a part she didn’t want to be.