What is Stephen's connection to Roger Antrim in the novel, The Well of Loneliness?

Roger Antrim is a bully of a child who often treats Stephen poorly because of her oddities. As Roger grows older, he joins the military. Roger meets Angela Crossby while visiting some mutual friends and they begin a love affair that eventually comes to Stephen's attention, breaking her heart. This love affair leads to Stephen writing a letter that will later come into her mother's possession and end their relationship. In the end, Roger is killed during World War I during the heroic attempt to save a fellow soldier, causing Stephen to reluctantly find some respect for the young man.