Sadly there are times when a friend says or does something to us that we find unforgivable, and that basically spells the end of the friendship. Only you can decide what type of mistake falls into that category, but when you can, be generous with your forgiveness and others will be generous when forgiving you.
Friendship is important to health and happiness of each one of us, but problems will arise. Things will be said and done that are hurtful, but they don't have to derail your friendships. Talk things over, be forgiving, and don't hold a grudge. These simple steps can help you maintain good friendships that can last a lifetime.