I love him more than anything in the world and he just doesnt love me back

I cant imagine life without him now. My halloween party, my birthday party, weekends. What am i gonna do? He doesn't feel the same and i don't know how to make him. I love him more than anything in the world and he just doesn't love me back. I almost begged him to stay with me. But i know in my heart it won't last, i just desperately want it to. I'll do anything i can to make it work. He said he'd give me a chance to prove he can trust me. But i don't think its all about the trust. Somethings just not the same when im with him. Maybe i know its because he doesn't want to be there. Im makes me feel so sick. I really dont wanna lose him.