Its in the character and the 'love' you gave. The more you give,
the more you will naturally expect back, thus the more pain you
will feel and the longer it will lingers.
Everybody have different ways to let it go. I just simply tell
myself, "Move on, sucker. She is out of your life." Once I DECIDED
that I make an effort to let it go and forgive all that had
happened. I also thanked that it happened, good or bad, so that I
learnt a valuable lesson.
Learn to forgive. Its not easy to forget. Forgive the person and
forgive yourself.