How do i get my boyfriend back read my story and help me please?

im 19 yrs old n i fell in luv with dis boi wen i was 14 yrs old but due to drama we broke up and he went to da mental house and his family hated me and i got really sick but in the 6 years we broke up we still loved each other cuz he would think of me wen he was with dis other grl later she broke his heart and he was like **** luv about a few months later we talked and we feel in luv again and went back out he told me he wait 6 yrs for me 2change cuz back then i was rich n was stuck up but i went broke and so that was all over he became really bad cuz he started 2smoke his friends were bad and wen we were 2gether i made him stop smokin and all da things he like to do and he wasnt happy so he left me but now that i think about it i was so selfish and now i wanna change but he wont talk to me while we were breakin up he told me im da only girl he trully ever loved and he has no luv left and he wants to be alone 4ever and i been tryin to talk to him but he wont talk wat should i do now?