Brian commits suicide and Vic's soul (god? his guardian angel?) shows him Justin's life without him. Brian decides not to die.
I remember that Justin leaves Pittsburg one week after the funeral. He leaves teddy bear Gus at Brian's grave. He leaves for New-York. He is beaten there and returns to Britin half-paralysed. He doesen't have sex any more and talks only to Gus.
Here:
http://archiveofourown.org/works/525088?view_full_work=true