Preserving a friendship requires many skills. One of the most important of these is the ability to say "I'm sorry". We all make mistakes. Hurting each other from time to time is inevitable especially in a close friendship. Some people are incapable of apologizing, because they are unable to admit that they may have made a mistake. There is no way for a friendship to last without apologies. Saying I'm Sorry in a sincere and compassionate way will preserve your friendship and deepen the bond that your share.