I attach myself to people. I have painfully low self-esteem, and if a girl shows interest in me I invest virtually all of my time and effort into them. This level of interest and effort has never been returned, and I know it's unlikely to ever be. When the inevitable happens and my interest finds someone else, it always devastates me. How do I stop this? Can I stop this?

Why do I care so much more for people, than they care about me?