Two words that is very easy to say "Move On!" yet it is so hard to do, why? It is because we still cling on to the memories of what we did previously especially if those memories were the good one. Well i personally classify moving on equal to 5 stages of grief ( Denial, Anger, Bargaining, Depression, and Acceptance).
Trust me it is a painful process, but in my experience it was the pain that made me value the process and learn so many things from it, but then again different person would experiences different process and there are some who don't want to move on at all and get stuck.
I had my share of this process not so long ago, i was depressed almost reached a state of nervous break down because i simply wanted to give up on life, but i did not give up, why? Simple reason, I wanted to know what's gonna happen next in my life if i face the "demon" inside of me, i believed in myself again with the help of those who truly care about me, i was really lucky.
So when you are in a really emotional stage and feel that you are falling down on your knee you may savor your depression momentarily only and then get up, promise yourself that you are going to face this difficult situation that you are in now, stand up and make your baby steps to moving on. In the beginning it will be hard to move on, but you'll definitely able to move on and realize that it isn't as bad as you might think.
I know you are sad right now, but trust me it will be better i promise...