When a relationship finishes, you might find yourself spending much more time alone. If you are able to consider the past and are resolved to move on, this time alone can offer you a feeling of freedom and space and you may very well find yourself enjoying your new-found solitude. However, if you are still mourning your last relationship and feel unable to move on, you will probably be filled with a sense of loneliness, and the quiet around you may simply serve to draw attention to your loss and feelings of restlessness.
It's important to be able to change this state of affairs around so that you can start to feel better about being alone. Try to think of being alone as a challenge - a change from your normal routine that opens up all kinds of possibilities that may have previously been denied to you. Take up some activities that you enjoy or that may have been difficult for you to do as part of a couple. Learn a language, take up pottery or join a gym; whatever makes you feel good. However, take things slowly; don't suddenly take up ten new hobbies to fill up your every waking hour, you'll only become exhausted. It's also important not to surround yourself with other people all the time; you need to learn to feel comfortable being alone.