My girlfriend leave me for my bad behaviour n nw she dnt want 2 give me any chance.plz tell me wot to do?

my girlfriend leave me for my bad behaviour n nw she dnt want 2 give me any chance.but i totally dependent on her till now.i am helpless.we were in the relation since 5 years.i cant forget the moments.what can i do now?i cant live without her n she dont want 2 keep relation with me any more..:(