Been there done that.
Loss is never easy no matter what you do. Be it the lack of closure, the questions (why did it happen, was it avoidable, should I have done that) or the thought of can I revive it.
From a person who has also suffered a deep wound that never completely heal, I feel for you. The pain never goes away 100% and worse you will get flashbacks when you see a place, thing, activity, etc. that you used to share with your SO.
Of course if that never happened, then you wouldn't be human and you would not have truly loved that woman.
Moving away from the doom and gloom, here is what I find that helps:
1) cut the cord completely. You are not doing yourself any service to keep the memory alive or to hold on to hope for a second chance. Believe that it won't happen and if it does, you will be in a better frame of mind to think if you will call this situation "great" or say, we broke up for a reason and that reason is still valid.
2) stay away from her "territory" and any activities or places that you might run into her or get flashbacks of memories of shared times together.
3) think about sales. Rejection is not the end of the world but rather gets you closer to the big sale! There are tons of women all around us and worldwide. The female population is starting to outbalance the male population. You are free to roam and choose again. Armed with more experience from the last relationship, you stand a better chance to find the right match for you.
4) stay away from alcohol. It is a mental depressant which will ultimately worsen your situation
5) go out and get laid. Feel human again (sex is as basic a need as eating and sleeping) and realize that it was her loss and that there are other women out there that find you attractive and who will cherish you more.
6) go on vacation to a singles kind of place like Club Med (or if you have the balls Hedonism II). A change of scenery and a casual fling or two with no strings attached can help recharge your battery and make the transition easier.
7) buy a motorbike and cruise the free open roads. I like to do this to get peaceful distraction time for myself when I'm stressed. Plus some chicks like a man on a machine (but don't make this the prime reason to ride. Ride to please yourself and not somebody else)
I wish you the best of luck from one scarred heart to another.
Just do the right thing and move on! Live in the future, not the past!