How do you forgive someone who hurt you? With the Love of God.
Romans 5:5 says, And hope maketh not ashamed; because the love of God is shed abroad in our hearts by the Holy Ghost which is given unto us.
Check your love level. If it seems a little low ask God to fill you with His love and to help you love that person.
Reminder that Philippians 4:13 says, I can do all things through Christ which strengtheneth me.
Forgiveness is a choice. Choose to forgive today.