John Cadman's Links
To Cadman, Matthew is a stuck up jock who thinks he's better than him. While Cadman rarely bullies Matthew directly (as Matthew is popular and at least Cadman's physical equal), he would definitely enjoy putting Matthew in his place one day.
In the normal person AU, Matthew is alive and the big man in the secondary school he and Cadman attend. Matthew sees Cadman as a rival and is disgusted by Cadman's bullying of other students.