Well I have been browsing these forums for a week now and thought I would contribute some of my knowledge and experience and how I got over her in one week.
The first question you should ask is that do you believe she was really the one? dig deep.. REAL DEEP and remember the real relationship how it really was and not how you believe it was.
and now ask yourself the same question again was she really the one. If he answer is yes (mine was yes both times).
This is a list of things you should Do
1 - Please..This is the most important one. REMOVE HER FROM YOUR FACEBOOK, SPAM, TWITTER...etc
She will play fucking mind games, she will go out with her friends and tweet about what an amazing time she is having (even if she is not), do you really want to see these? Do you really care if she is having a good time? Do you want to see pics of her having fun with other guys?
2 - Read books PUA BOOKS any book, And don't read them at home go to the local starbucks or cafe nero and read
This will help you so much both your eyes and mind is occupied and you are doing something beneficial.
you are learning something new, and you are out of the house.. This really helped me.
3 - Watch 500 days of summer
I promise after watching this film you will feel great even if it is temporary it will help you at the beginning or if you cannot sleep. I watched this movie twice and both times I slept like a baby that night.
4 - Everyone has said this but pick up a hobby....
I did a little online gaming which if you have an addictive personality please avoid this and pickup a different hobby. I played league of legends its very fun but please PLEASE avoid online gaming if you have addictive personalty (you know yourself better then anyone).
5 - Imagine she is fucking someone else while masturbating
I didn't learn this technique from anyone it just happened while I was fapping and I forced myself to finish. But I promise when you can imagine her fucking someone else and it really doesn't bother you....You are over her.
At first this was very hard (pun not intended), but you have to soldier through it, by the end of the week if you can fap out while watching porn and imagining her fucking a random guy and its not bothering you. Then you will be over her.
DON'T LISTEN TO LOVE SONGS (Listen to "forget you - Cee lo Green" this type of music)
DON'T CALL HER....
DON'T TEXT HER...
DON'T BE HER FRIEND....
DON'T GO PLACES SHE HANGS...
DON'T TALK TO HER FRIENDS (they will only laugh when you are gone)...
DON'T ASK FOR YOUR STUFF BACK (unless she has your £500 camera)...
DON'T STAY AT HOME ON YOUR OWN...
HANG OUT WITH YOUR FRIENDS (Please do not avoid your friends)...
NO DRUGS NO ALCOHOL...
WE DON'T WANT TEMPORARY FIX.
Last but not least BE A FUCKING MAN and Have control over your emotions...
I saw her walking with her friend a few days ago and as much as I wanted to say hi, I just put my head down and carried on walking.
You have to realise right now that if she was the one.. "IF SHE WAS THE ONE" ...it would not have ended.
Did the Matrix end with Neo Dying?...I don't think so 
Talking from experience the above worked for me, Please feel free to add anything you want.
hope it helps someone.
CHAT