Breakups

i started dating this guy and it had been 17 months. i am only 18 years old and he is 19. thing is we broke up because of my mistakes. i dont know how to get him back as he is in a rebound relationship. i miss him. he haed me going clubbing smoking drinking and all. we used to have fight and he would say sorry and try and change the topic but i would still fight ith him. what am i suppose to do ? we were very serious about each other. break up has happened 4 months before. we talk very rarely and see each other once a month by chance. a month back i had called him and he said he still cares ffor me but the new girl is the girl he cannot hurt. i seriously love him but his friends and others give him wrong information about me as i am stil the same i roam with guys and stuff. i dont want to forget him. he is amazing. i have tried talking. he doesnt meet me also. i dont know i feel depressed all the time. i want my boyfriend back.