Caught Up In A Downward Spiral

I know that it's not impossible to move on. But how do you break up with someone who was never yours in the first place? Someone who's also scared of risking it with you. It's true, unrequited love can be devastating. It just pulls you down, the depressing feeling and the pain of it. It feels like you are reminded over and over again of how you will never enough -- sometimes makes me feel that I am lying to myself when I am affirming myself.
I don't know if I am asking too much -- I didn't even ask anything. But maybe that's the thing, I never asked anything. I guess I will need to really take time and find out what's my purpose...these men, they lift you up and just leave you hanging on your own. 
I hope that one day, I'll finally get over with this guy and just move on. I thought I should already know how to deal with this. I've gone through this before and it shouldn't hurt that bad...ahhh, but what do you know, the pain is always overwhelming...
...always overwhelming.