The moments of break ups is not the time to be moody and thinking about what you've lost because often times it is not certain that you guys would come back together.
The best is to think about the wayforward in your relationship life by doing a review of the previous one, your flaws and imperfections as well as that of your ex. By doing this you'd make sure you don't commit the same mistakes that you did in the previous relationship and improve the future one.
Thanks for sharing.