I'm so sorry op, I know how you're feeling and it's incredibly hard no matter what the the reason is for things ending... As someone else said one of the best things you can do is delete all memories....
All those texts, emails, photo's, facebook messages etc etc, home movies; delete them...... block her on facebook, even delete her number, block her email.... everything you can think of. It may sound extreme but if you don't when you start feeling low you'll start going through them and make yourself feel worse..... if you don't delete her number you will end up calling her and giving up your self respect.
If she texts you over something important like in regards to coming off the mortgage, respond then delete don't give yourself any opportunity to crack.
Then allow yourself time to wallow in self pity, but after a week or two of not doing anything about it get up and do something productive! Go get that bike you want, volunteer for something, take up an old hobby again or find a new one.... spend as much time as you can with friends and I promise in time you will care less and less...
There will be times mate where you feel you miss her and are desperate to have her back, you will have setbacks but you ill be okay.... then you will be fine, then you will be good.