What do you do after the most important person in your life left you?

that was a bit of an understatement actually. where do ya go now that the person that was your life.. the one who made you happy and whole and made all efforts worth while, left you? kicked ya to the curb and so easily walked off.. well i've accepted it now and i do want to move forward, only prob is what do i do with my life now?/how in the world do i move on when i cant forget anything. he was my everything/i made him that so now it feels as if i have nothing. i wanna be happy like i used to be but i dont know how, all tha things i used to care bout/used to interest me, i stopped caring bout them, what do i have to care bout (besides church, family, friends) i fl like theres an empty place now.. and no matter who ive ended up dating they dont fill that/replace or compare to what i had with him. honestly i still miss him like crazy and still get upset over it sometimes (its been over half a year.. i kno i know im pathetic :/) nvr was over a guy b4 him tho :/ my pride used to be so important, but i know id still risk everything for this guy who obviously just stopped caring, in a heartbeat :(.. it still feels like just yesterday we were holdin hands, walkin outside in the sunshine laughing and pickin, his presence making my heart beat faster and slower at the same time and my tummy havin so many butterflys lol and we were just relating, convo flowing and making each other just smile. and seems like the day 4 that we were holdin each other tight then gently and sweetly kissing, and he was just petting me right before we fell asleep on each other).. my heart still hurts, and i know ill have a empty place there where he still has parta ma heart always, but i wanna know how i can stop feeling so dang down and empty/incomplete w/o him.. how do i shake this endless deppression and be happy regardless of my broken heart? sorry bout tha longness lol and appreciate any advise y'all, thank yas. :)