There is a nice little website that has some good advice on past and current relationships and it is, http://exfactorguidereview.net. It is a good idea to build on your current relationships to make them stronger. This site also gives you some advice on how to restore lost relationships. However, sometimes you just have to cut all ties and let go completely. Sometimes there is nothing to linger for and nothing to rebuild. This does not mean the relationship was in vain. Often the best thing that comes out of a relationship is a better understanding of how to make the next one work.
There is a lot to be learned from a past relationship, even if it was a horrible experience. You can learn what you do not want from a significant other. You also realize who you do not want to be in your next relationship as hindsight is quite revealing. You might recognize traits in your last relationship you do not want in the next one. It is common to feel confused after a breaking up with a mate. Even if you still have not figured out what you want you might have a better idea of what you do not want the next time around.
Retrospection does not have to be negative. It is as equally important to note the good things from past relationships. What parts did you like and enjoy? What qualities, in your significant other, did you like and would like to find your next boyfriend or girlfriend? Taking the time to think about these things not only can help you recover in a healthy and positive way, it can help you make healthy decisions about your next mate.
Letting go of a past lover is often painful and difficult. No matter how futile you might feel, that past relationship was not in vain. It was in your life to help you get to the next place, to the next relationship. Try to be open-minded and look for the positive aspects of why you met your ex-lover and why it ended. The most important is to remember it can help you get to what is next.