Isn't it sweetly strange when you have a person that is in your past and you just can't get that person out of your heart or head? Even after time goes by, you still think of that person and perhaps what might of been or questioning yourself if it ever really was. Those are bitter-sweet memories. I am not really sure if I like them or not.
It's especially difficult if there was an unresolved end to the relationship...whatever that relationship may or may not have been. Sometimes, the not knowing is simply the worst there is. How can you even learn a lesson if you don't know what went wrong or why? It just plain hurts and it's a hurt that scars and never ends.
That's really all I can say on this for now...it's still raw after all this time.