Listen... I have no idea why he left you or what your relationship was like, but I have a few things to say. You can always try sitting down with him, to see if there is a way that you could work out your problems and continue on with your relationship. If he isn't interested in doing this, then you need to be strong.... you need to know that if someone doesn't want you then they're not worth your time. You can find someone else who will love you like you love them. That is the way healthy relationships work. You said you can't live without him, and I have to say something about that too. If you want to be a happy person, you need to begin with loving yourself, and you need to be able to be happy on your own. Your happiness can't depend on another person. Maybe you need to spend some time on your own, doing the things you love, spending time with friends, finding your own inner happiness... because only then, can you, as a whole person, find another whole person and share your lives together. I hope this helps you. I'm sorry for your pain... be strong and good luck.