The ex-student, named locally as Tim Kretschmer, entered the school in Winnenden, a town of 27, 000 near Stuttgart, at about 9.30am (8.30am GMT) and began firing.
According to the National Enquirer, the Swedish ex-model was "shocked" when the "hunky student" kissed her while walking back to her car in the school parking lot.
Each jilted student was hooked up to a functional magnetic resonance imaging fMRI scanner and asked to look at a picture of his or her ex which - oh, the indignity!