How to forget someone's betrayals?

Remember that God loves that person (may be hard to think about), and it is not the person who is bad, rather it is the words/action(s). Remember who you are in your faith, and ask God to change your thoughts, to take away these negative feelings and to set your mind on Him and be at peace, rather than holding onto things. While praying, say that you are willing to forgive that person, but you need God's help in letting it go (offering it up to Him so He can help you). Also, pray regularly for the person that has betrayed you... it is truly a freeing experience and your thoughts about that person will change. Whenever you find yourself remembering the betrayal or having a negative thought about that person, remember that God loves that person and ask Him to help you to let it go. Also, ask God to help you see if you are doing anything wrong, anything that would hinder your ability to be at peace. Don't look to yourself, set your eyes on God. If you ask, He will help you because He loves you.