Loneliness but also because I just really hate myself. Like even if I wasn't myself, I would consider him, who is me, to be one of the objectively worst people who has ever lived. There's so much evil, hatred, greed, laziness, and other unsavory traits lurking within me that can't be resolved without ending me. The part I hate the most about me is that he (me) is solely to blame for ruining my life through sabotage and incompetence. I am also my harshest critic, and none of it is ever constructive. I am my worst enemy. My most brutal bully. Why wouldn't I want to kill this tormentor of mine? Why should I have to be forced to forgive my biggest abuser? Why should he get to get away with a happy life just because he happens to be me? As I've said before I feel like I have been constantly split between two selves, both of which are equally evil and equally stupid. Also I never know which one I am. All I know is that I hate him and myself and he hates me and himself too.
The only time I ever even came close to merging these two quantum selves was when I almost had a chance for my first relationship but since that failed we are now further apart than ever. I can't wait to kill him (me) just so he can stop bothering me (him).