Check out this YouTube video about forgiveness by Corrie ten Boom.

I highly recommend watching this video.

Then came Peter to him, and said, Lord, how oft shall my brother sin against me, and I forgive him? till seven times? Jesus saith unto him, I say not unto thee, Until seven times: but, Until seventy times seven.
- Matthew 18:21-22 (KJV)

Corrie ten Boom is awesome.