Hi, @mirrors, let me answer your questions:

1. The point in you forgiving him is that it helps YOU. In the case you are describing it will only help you to feel better with that person.

2. Nope, it just means that you gave that person another opportunity and you forgot about the bad situation which happened to you with him/her.

3. I think that if a person did something which hurt you, then refusing your forgiveness is impossible.

Thanks for the interest and for the awesome quote you gave! :)