Invinsible

When someone hurt you so much, you and him could never have a conversation again. What would you do when you meet him again? Pretending it is invinsible? Or just ignoring the existing? What I've figure out that I could pretending we have never meet before, forgetting everything we've been through. It is right to "pretending" everything have never been happen? Can I become the Harry in Spiderman 3? Feeling nothing about the past? Deleted like a files inside the computer?