What can I do if I can'leave without him I really tried? please tell I want him back.

We will need some more information than that to give you the best advice we can. How old are you and he? Why do you feel you can't live without him? How long have you been together? Or are you together?

You get professional help to get rid of your obsession for this person. Of course you can live without him... it is all in your head.

Good Luck,
Javi