"I believe that no matter how good a friend is, they're going to hurt you every once in a while and you must forgive them for that."
It takes quite a bit for me to get hurt, especially by friends but when I do, it's not something I forget easily. People say you should "forgive and forget". I disagree partially. I believe you should try as hard to forgive (it takes time) but not forget. I feel you should remember because it protects you from getting hurt the second and consecutive times. Also, you'll understand that such a friend's actions and words should in fact be treated lightly and somewhat shielding you from having to deal with he/she troubling you. I learnt. Fast.