After 8 months its over and i hurt so bad i just keep breaking down i cant stop crying?

i cant see my life without him he was my everything i did everything for him but he just cared more about his friends hes 21 and he acts like a 5 year old i hurt so bad today i tried talking to him about how i feel i said 'why cant you spend more time with me? instead of your friends.. dont i meen anything to you.. he didnt ansa.. 'why dont you ansa me you obv dont care anymore' i started to cry and he didnt even reply then when i said do you even wanna be with me? he replyed with 'im not botherd' so i said its over and on the way out he started to laugh and said giza hug then been sarcastic. after 8 months how can he treat me like this i hurt so bad hes mademe feel like ill never find anyone else i hurt so bad and he's prbly out havin sex with his next girl i do think hes cheated and its making me feel ill i havnt stopped crying since he left 5 hours ago and my heads banging i cant breath i love him and im never guna see him again i deleted him from my fb stat and i feel so hurt :'( why would he treat me this way after 8 months when i gave him my everything and all he gave me was heartache :'(