Advice for getting your girl back?

I feel like Morris character at the end.
Girl broke up with me 3 months ago.
Tried calling her parents, emails, fb, etc

she ignored me, and her parents told me not to call them anymore. I kinda gave up.

few weeks ago, she messaged me on a site we met on. and on another site I no longer visited.

But cant get a reply from her since.

the break up was over something most people agree she took way over board. we had only 1 argument.

year long relationship. fully committed.

I see on the news how Chris Brown and the Rianna girl got back together,

and how Justin Bibber and the Gomes girl got back together.

How can I convince her how much I really love her?
wow this *beep* hurts badly how I feel. I have nobody else to turn to.