This is real talk. The way I got over my long term relationship was to focus on the negatives and positives of the relationship. Just take some time to engage in some deep thinking and examine yourself. You will most likely come out understanding why the relationship didn't work and be ready to move on to something better.
Why focus on the past?
Why focus on things you can't change?
Value yourself as a man and move on, and not look back like lots wife, every day you spend looking and reminiscing about the past is a day wasted.
Throw the past in the bushes and get on with your life.
It's done it's over cut contact and move on, enjoy your freedom etc.