Apology vs Revenge

Someone asks me "what would I do if anyone who hurt me came back in to my life no matter the reason why", I didn't know what to reply. Obviously some names were throw and depending on who that person was the answer was harder or easier. It was supposed to be easy because every situation is part of my past but unfortunately some scars are still healing. I take my time to heal because I try to do it the best way I can. I don't rush myself. When something happens I put every feeling I had for that person in a box till I am ready to open it and deal with everything.
 Some people have hurt me and never acknowledge how hurt I was whether because they were complete selfish or just blinded by their own pain ( not the same for me) Of course apologies from them were never said. That never stopped me from keep on going no matter how bad I hurt or not, whether or not an apology was said. Maybe it is good that I am that tough-cold, maybe not. What I know is that thanks to the way I am I get as far as I am even though it can bring some "headaches" along the way.
At this point in my life I wonder whether or not it is worth to say everything that was left unsaid when those people that hurt me come back - if they even do. Some will say it is good because you let it out but wouldn't be a way to open up scars that are not need to be opened anymore? Would it change something? I don't think so I mean the damage was done. Some people will say maybe you need to help that person see their mistakes but I think at this point ( 23 or older) people know and are big enough to know when they are screwing things up ... It is easy if someone cries, gets upset.. you are screwing up STOP think and do something.
To be honest I don't know what or how I would react if people who hurt me the most try to come back into my life. Probably I will just listen to what they have to say. Depends on how things go from there we can talk about the past or how I fee which is not the same than giving them a chance... that another story. All depends on how people act and behaves, how pure their intentions are.
On the other side, if they never go back oh well! I - you should be able to learn to live without having all the answers-apologies. Life is so complicated to try to understand all the "whys" or think about all the "What ifs". We have the present and where we are now. It is up to us to keep digging the whole we are or try to do something to get out of it. I will never take revenge or hurt people on purpose because I seriously don't see the point. Hurting them will not erase the pain they caused me in the past or make me better in any way or form so why would I do it? Thinking, questioning or revenge will only consume me or you but not solve anything at all.
Looking back should not be an option for no one unless it is just to remind yourself what you've learned and see how far you have gotten no matter what situations you were involved in. There will be times you will break down and no matter what some people say ( that you are weak or what other ignorant stuff they can say) it is OK! You are not a robot and you just need to stop and  process what you are feeling...try to do something to go and keep on fighting your battles and go forward with the journey. You are here for a reason and you destiny is to be happy so do it! Because we all can do it!