well I am not very good at giving advice coz I guess I do not have much experience but I can definitely feel your heartache. I suppose in such a situation the only thing to do is to let time lessen your pain. It make take ages and you may never be healed totally, but you will definitely feel better than now. He may remain the person you love the most and it sucks that you cannot be with your greatest love, but that's what it is.
Are you very sure you do not want to be with him anymore?If you are absolutely sure then cut contact from him TOTALLY. They say women are fickle-minded, but I think when it comes to love men are more capricious. My ex told me he loved me very much but two weeks later he broke up with me. And of course until now he tells me he still likes me but he is seeing someone else already. So sometimes I really dunno what this men want. They can never decide.
I think time is the only real effective healer. For me, hanging out with friends or burying myself in work did not help at all, it jus took my mind off from the problem temporarily, but emotionally I was not getting better. But as time goes by, the pain is getting lesser, slowly but surely. But cry as much as you want and pour your woes to friends, online forums as much as you want, dun suppress it and dun think that is silly to cry over him, just do it, gotta let it all out. And one day, you will jus get so tired of crying u dun feel like crying anymore. Well....at least dat was what happened to me. Trying to convince myself that I deserve better and he was not worth it did not help at all, coz at the end of the day I find that I still love him very much and that was all that matters, regardless if he was worth it or not.
And I cannot stress how important no contact is, because I made a mistake of keep in touch with my ex and now nine months later i still haven gotten completely over him and not to mention all the additional heartaches and self esteem destroyers that came along with it.
Anyway I wish you all the best. I think my healing method sounds rather pathetic but i think that is how it is when you are dealing with some one that you love very very much. Take care ya...