The Past is the past or is it?

It has always amazed me how you seem to think, I have moved on its in the past. Then one day it creeps up and bites you. Its like wait a minute how did that happen? I am the type of person that learns from those past hurts and doesnt live in the land of what once was..But yesterday all I was telling was a story, a story that appraently still haunts me and affects me. You would think because the parties have been forgiven that the affect of the situation would not hold true to your daily life. I tell the story and I still try and catch my breathe and afterward Im exhausted. Is there something to be said that no matter what certain experiences in our life will effect us forever? I wonder... The past is the past or is it really...