How to get my x gf back?

(Before you read i am very advanced for my age!)ight im 13 an shes 13 we went out for about 4 months and she broke up with me because i wanted to kiss her or some bull**** that was 2 months ago and i got over her a loooong time ago but my feelings are just now coming back.but more detailed we were very in love(and dont tell me im too young bcuz ive had many other gfs and she was just different)we would tell each other that that we loved one another and stuff. well the problem started when i was gunna try to f*** her but her friends told me she wasnt like that and that she woul break up with me so i tried to turn her into afreak startin with kissing i was gunna kiss her but somehow she found out broke up with me. i didnt know she was that clean! so i think i want her back.(she finally kissd someone not too long ago).so i need to know how and what i can do to get her back.