Please help , very important....confused and hurt..ten points .?

Alright so me and my ex dated for 8 months , and I fell in love with him . Well we broke up about 6 months ago with the intention of getting back together..that never happened. I'm a junior and he is a senior..in highschool. Well he fell out of love with me I guess..and he is head over heels in love with his best friend of 4 years Carly. Me and my ex have been **** buddies ever since we broke up basiclly..I'm still sooo in love with him it's sick. I'm depressed all the time, whenever i hear his name it physically hurts..I cry alll the time..and no matter what it seems I cant get over him . And he treats me mad, doesnt talk too me unless he wants , unless i ask him a question. but we never just talk , but when he comes over too have ..everything seems too goo back too normal..he recently had with another girl..but this past monday came back too me , i dont have the heart too reject him..i know yu all are gonna say just stop all communication, well its hard. im so in love with him, and the fact he isnt hurts..sometimes its too much too bear. i tell him and he says he doesnt care , and by having with him it makes me feel like some part of me he still wants..and i'm something too him , if i turn him down he will goo crazy and never talk too me again..trust me. i know, how it works..or how he works. I'm just scared shitless i'm going too lose him forever..i just love him with everythin i have..every guy i talk too i stop..cause i cant get him out of my head..when i see him i iget chills, i get nervous. i love him and he is mny everything..i just dont know what too doo ? suggestions ? advice on the whole situation ? what do i doo..please help. this almost leaves me suicidal..i just cant take it anymore..