Stuck between inner voice and the voices around...

Is it wise enough to do the same to people what they do to you? Is it good to trouble someone's soul and leave it  to die in guilt? Are people really genuine when they say they are guilty or its just another part of the game they are looking to play? What are these things all about? Am i being a sadist? my inner voice is saying each time that i should not do this.. won't it be same as what he did to me?? What happiness will i get in leaving someone in trouble.. what??? nothing, absolutely nothing. The day on i have received that call and i gave rude replies,, my soul is troubled. Each moment i feel like messaging and saying no i have completely forgiven you can live your life peacefully. Agreed to the fact that what he did was all wrong, very bad and I cannot ever forgive him for it all.. never. But was i always correct? No, even i was somewhere responsible for it all. It was not one man wrong.. No way. But the voices around only say.."let him repent as what he did was wrong and no need to be Gandhi and so good all the time." agreed to all points but will one word make much difference to me?? I don't know what the situation is all.. leaving it all to time as it is best healer..