Rostand uses De Guiche to create serious complications that have pathetic results. Explain.

De Guiche sarcastically congratulates them on their well-laid plan, but tells Roxane to bid her new spouse goodbye since the regiment is leaving. Roxane is horrified. Drumbeats sound in the distance. Roxane begs Cyrano to look after him, and to tell him to write her a letter every day. Cyrano says to himself that he can promise that. All of these heartfelt, profound professions of love go nowhere for Cyrano, however, for a hasty wedding between Christian and Roxane is arranged (not to mention their kiss) after the serenade.