Not all friendships last forever and nor are all feuds eternal. Some people argue one day and agree the next. Even the most heinous crimes can eventually be forgiven if a desire to move on is strong and sincere enough on both sides. Don't get caught up in the way things used to be. Even where doors have been firmly shut, there is now a chance that they may open. Ask positive questions; expect encouraging answers. If you believe that a good outcome is possible, you may yet make valuable progress.