Get my ex back

Hi everyone..I have been heartbroken for abt 4 and a half months now..long time..been doing a lot of reserach here on the net..gathering as much info as I can..for the first time i was tempted to join a blog like this one..Mayb someone can help me here..and maybe I can offer sum advise to u too!
My ex and I have been broken up for abt 4 and ahalf months.. we live in a university campus where we also go to law school..we were very close frnds until we started dating each other and it just happened..we had awesome frndship..loved each others company..but it was all fun..never emotional..i even liked another guy at the time and wud tell this guy abt him.. but somehow he still started fancying me..he tod me later taht it was physical attraction for a few months and then it grew..and finally after he saw me having problems with a few friends he softened up and realised i was a lost child who needed protection..I didnt have feelings at the time for him and yet I gave it a shot.. My felings for him grew..we were together for a yr and a half.. and as ppl wud say on campus..the closest couple ever..we had awesome chemistry,cudnt keep our hands off each other lol..and had a 100%comfort..cuz of our frndship..we were very close..but there was a problem..i am frivoulous by nature..i always took him for granted..between us I am a rather pampered girl..used to a lot of attention frm the opposite sex..my ex was a simple,principled man..not a man of words but actions..ppl respected him for the things he stood for..he was also very mature..he is 2 yrs older to me.he loved me a lot.doted on me..when i waas with him he wudnt let me lift a finger..did everything for me..but we had differences cuz we were diff. ppl..he wanted a little submissive girl…who he cud tame with his love..gadually he became over possessive and aggressive..cudnt stand the thought of me with any man..and i have many male frnds and at the risk of sounding arrogant.. a rather huge male following..
cuz of these differences..we wud break up and get bak within a day or two max..then i went on a holiday..and met a guy..overseas who i sort of fancied and who did too..but nuthing really hapened..i came bak and told me ex abt it cuz i felt guilty,,since he was there at the airport and then had taken me to this lovely suite he had booked for us since we were meeting after 3 months..i told him ..he didnt speak to me the whole nite..in the morning..after many apologies on my side he said..i wont let u go..i might act weird sometimes but doesnt mean i am letting u go..and kissed my hand..we got bak to campus life..it was ok..though we got irritable with me..wud fight with me all the time..and i wud fight bak..and end up thnking abt that guy,..finally..after 12 days,,one day i asked him things seem a bit different..i thought it was one of our usual fights..he said.ya hey r..i said do we work on it or et it go..he said i think w ha to let it go..i asked y..he said..i dnt feel it nymore..u killed it..i still didnt take it seriously.we talked.and he told me .u r too much for me to handle i have to let u go..i went away..and ten it struk me..after that i stratd begging,pleading,mailing and everything..but it ony pushed him away..then i told him i am moving on..he didnt say anything..and i let it go..atleast tried..i still cudnt but didnt contact him..soon i found a change in his behaviour..he started chain smoking,doping,drinking a lot,making a whole new set of frnds..i was shocked cuz he seemed a new person..
i still didnt contact him..and then exams happened..he was busy with a new crush everyday..though he never made out wit anuyone,,just crushes..and even screwed up his exams..exams got over and we all went home..after a month and ahalf.we got bak..i met him..had some work.he was very warm and sweet..not bitter like he had been before,,earlier he wud just walk off..he even hugged me and kissed me on the head..and then i lft for home for some work..but then on chat when i wud see him..i wud try and talk and he gave out msgs that he didnt wanna..so i stopped..after i came bak..which has been 2 weeks..to the campus i mean..he has not even said hello to me..he totally avoids looking at me..if i a sitting sumwhere he aboids coming there..if i happen to b around..he become a bit loud..he laughs loudly..runs..plays..but when and if our eyes meet by accident..one of us looks away..i have caught him looking at me when both of us r unaware..
WHATS GOING ON..please help me..both of us r single..we have 3 months to go ebfore we graduate..i am leaving abroad for studies..he wants to find a job here..those were how our plans always were..tht was also a factor he didnt like wehn we were dating that i wanted to leave ..he had even wanted to marry me..then how can he turn this way..PLEASE HEKP ME..someone