I Don't Fear Death

I've never really been afraid of death but I just can't seem to get the idea that someone from my school who used to really ruin my school days was killed I mean I hated them so much but I mean they're gone now shouldnt I feel as if all the stress is gone? no matter how much of a good day I have I see his face everywhere its as if everyones fingers are pointing at me just typing this makes it seem so messed up its dragging me down and I've never really cared about anything I'm mean never why am I reacting to this when it had nothing to do with me?