When you think of immortal, you think of never dying, right? Cuero did too, after surviving a disease by becoming immortal, until he met Violet. As they slowly fall in love, Cuero realizes he is as immortal as he once was. Love is a powerful force
He's one kind of person, you're another. When life is going along normally, you're almost the same. But when life turns strange, suddenly, you're different people entirely.