I'm an extremely introvert individual who basically uses women for one purpose (yes, I am a womanizer).
Till this day, I've only been in one relationship in my entire 23 years of life. Me and her were together for about 8-9 incredible months (possibly the best time period of my life so far), and friends for about 2-3 years before we got involved intimately. I can say surely that she was the only women I ever 'loved' -- back when I use to believe in such an emotion. One day, she just left me and went back to her cheating ex. It was something I never understood. I mean, we were extremely happy together. We were talking about traveling the world and getting married.... and that was that.
I minored in Psychology, and was able to delete and strip most of my memories (and the emotions attached to them) of her. However, I fear that the relationship left me damaged. I find myself hurting other people to avoid being hurt myself -- a self defense mechanism that developed shortly after the relationship, I suppose. I also notice that my personality has become more cynical and 'darker' since. The strangest aspect of all this though is that I want to stay this way. It serves a purpose, in my opinion.
All in all, I think it's better to stay single. I've been alone most of my life, and it doesn't bother me. I travel and do what I want. Some people weren't built for relationships.