Why does the German student go out in search of better lodgings?

The German student's situation in life has changed dramatically. He thinks he's just met the woman of his dreams, a beautiful, raven-haired lady he discovered hanging around the guillotine. He takes the lady back to his modest student quarters and declares his undying love for her. She reciprocates, and the two young souls are united as one. Influenced by the fashionable ideas of the Revolutionary era, the young couple don't feel the need to formalize their new bond through marriage. Instead, they will live together as if they were man and wife, joined together by love rather than the formal ties of matrimony.
But even if the happy couple are not going to get married, they're still going to have to find a more appropriate place to live than the German student's cramped, poky digs. So the student sets out bright and early the following morning to find himself and his soulmate more spacious accommodation. Unfortunately, when he returns—spoiler alert!—he discovers that the woman he thought was the love of his life is actually a headless corpse who'd been guillotined the previous day. The German student does indeed find new accommodation, but it's not quite what he had in mind. Because after seeing the young lady's severed head tumble to the floor, he goes completely out of his mind and winds up in an insane asylum.