i feel you man. I used to feel the same after i broke up. But then i started to do things that i can do only when im single. Like not washing my dishes when i eat or trying to flirt with other girls...its more fu to flirt than to be ina  relation. So, try to feel happy being a single. Many people get envious from single people. So why not enjoy yout single life. Enjoyit as it is not for so long, single life is what i mean by not so long.