It is very, very rare where a slight that turns into a grudge that is in need of forgiveness is only about one of the parties. In most of our day-to-day situations - with colleagues at work, with your partner, with your children, with your friends - most of the time, if you really got down with each other and put aside your pride and your defensiveness and you had those hard conversations, you'd find a place where both people had something to ask for forgiveness from the other and to forgive the other.