Final answer:
Cyrano's reaction to Roxane's marriage shows his selfless love as he helps her be with Christian, whereas de Guiche reacts with anger and pettiness, revealing his possessive and self-serving love.
Step-by-step explanation:
The reaction of Cyrano and de Guiche to Roxane's marriage in the play 'Cyrano de Bergerac' contrasts sharply, revealing the nature of their love for her. Cyrano, who cherishes a secret love for Roxane, conceals his feelings and proves his selfless love by helping Christian woo her, despite his own heartache. On the other hand, de Guiche, who lusts after Roxane and considers her as an object of desire, is angered and frustrated by her marriage to Christian. He reacts with pettiness and seeks to use his power to interfere in their lives, showing that his love is possessive and self-serving. This comparison between the characters' reactions to Roxane's marriage illustrates the difference between true love and self-interested desire.