I was hurt by someone's actions a while ago, and didn't let him know. I still feel hurt, but I don't think confronting him will change the situation. According to Judaism, will I be rewarded from holding back in a situation like this or should I confront him just to get it off my mind?
_The Vilna Gaon writes that anyone who is able to hold back and not say things that will hurt another person merits experiencing the true light (Ohr Haganuz). I am not sure if that is exactly applicable in this case as it might be beneficial for you to say something if you feel that something good will come out of it. That means that if you think by speaking to him in a non-confrontational fashion he will listen and be surprised that he hurt you, and he won't be offended by what you tell him, he might apologize to you or explain his action in a way that calms you. In this case I think that you should clear the air with him. If, however, you are not sure what kind of reception you will receive I recommend that you work on your own feelings of hurt and try to forgive him for what he did to you without discussing it with him. This is exactly that kind of a situation that the Vilna Gaon is referring to.