Those are two different stories, of course. Would be a highly unique story to fit the full description. Anyhow, lost one of them ages ago and the other more recently when I had to restore my computer from backup and I'm hoping someone can point me in the right direction.
1) The first story is a fairly recent one where the protagonist is a werewolf or perhaps a weredog. He starts out wanting revenge on a girl but ends up rescuing her and getting shot. That's the last part I read and now I can't find it under were or transformation stories. Edit: And of course I just found it. Literally under a minute after posting. Shaggy Dog Story, by awnlee jawking
2) The other story isn't so recent, I think. Four main characters: Protagonist is the nice guy type, his "friend" the jerk former jock type, and the beautiful girl next door married to the cheating jerk. Beautiful woman moves to town and marries the nice guy, but cheats with the jerk. May have been blackmail. Nice guy ends up impregnating the GND, his wife gets hit by a car, and he marries the GND. Hope that helps.