@Mickeyyyyy i am gonna give more of a materialistic view on this problem. If they have done something terrible to you despite knowing the fact that it will hurt your sentiments then they don't deserve the love you accounted them for. And if they want to make amends give them a chance but they are gonna have to start from scratch to get to a point where they regain your trust. And if they fail to acknowledge what wrong they have done then you have got no business with them. Just defy their existence in your life and learn from your mistakes and analyze where you failed to make a correct judgement about that person.
I think most of you are going to disagree, but thats how i deal with people being an introvert