A person who sincerely fears the Almighty should forgive someone who wronged him when that person asks for forgiveness. He should do his best to return to the previous state of loving-friendship that existed before the other person erred.
We find in the Torah (Genesis 50:21) that Yosef forgave his brothers for selling him into slavery as soon as they asked his forgiveness. He told them that because he fears G-d they need not worry.
Is there anyone you have not yet forgiven? If yes, imagine that the person has the wisdom and courage to ask you for forgiveness. Visualize yourself forgiving that person. The next time you encounter that person act with the friendliness of someone you have forgiven.
(see Ralbag - Shaar hashalom, no.7)