What happens to the German student in the end?

In the end, the German student loses his sanity and is committed to a mental institution.
The story is about a young German student by the name of Gottfried Wolfgang. Gottfried is said to be of a melancholy disposition and prone to wild fancies about the supernatural world. Because of his unhealthy predilections, Gottfried's family sends him to Paris to finish his studies.
In Paris, the unfortunate Gottfried is dismayed to find the country engulfed in the bloody Reign of Terror. So, he keeps to his apartment and spends many hours in the great libraries of Paris. During this time, he begins to indulge in romantic fantasies about a very beautiful woman. Gottfried has never seen this woman before, but he becomes obsessed with her. She appears in his thoughts during the day and in his dreams at night.
One night, on his way back to his apartment, Gottfried passes by the fearful guillotine, the instrument of the French Revolution. He is shocked when he sees a woman at the foot of the murderous instrument. Upon further investigation, Gottfried discovers that the woman is none other than the one who has been haunting his dreams.
Gottfried takes the woman back to his apartment. When he discovers that she has no family, he pledges himself to her. During the night, they consummate their love. The next morning, Gottfried leaves in search of larger quarters. When he returns, he finds his new bride dead, with her head hanging over the bed. Frantic with grief, Gottfried calls the police. When the policeman sees the body, he proclaims that the dead woman was guillotined only the day before.
Additionally, when the policeman unties the collar around the corpse's neck, the head rolls onto the floor.
Upon seeing this, Gottfried loses his composure altogether. His old anxieties return, and he imagines that the evil spirit that once dogged him has returned to claim his soul.
In the end, Gottfried loses his sanity and is committed to an asylum.