I know how hard it is. I was dumped after 5 years, and I really thought he was the one for me. As hard as it is, the best thing to do is to not keep clinging to what could have been. They don't want you anymore. You must accept that and understand that you are doing yourself a favor by dating new people because you deserve someone who wants to be with you. Whatever the reason is, it doesn't matter. YOU DESERVE BETTER, and if you let yourself, you will find someone better!