Marinette broke three hearts
Nino doesn't count. He thought he had a crush on Marinette, but after spending time with Alya, he thought wrong.
Do you mean two? Not three. Because Ladybug just crushed two hearts not three.
Three. Theo, Nathaniel, and Chat.
Chat is more like... Unrequited.
TWO! Becuase he broke Nathaniel's and Theo's, not Nino, or Chat's either.
What do you think?