Is it okay for me to do this?

I just wanted other opinions before I make a decision. She just abruptly dumped me after 4 years. I never yelled at her, hit her or took anything from her. I bent over backwards to be respectful and supportive. This is just too much. I want to kill myself. I'm not close to anyone in my family. I have no children. I have friends, but I think they will quickly get over my death. I guess I still have doubts, or I wouldn't be asking this question....