How can i make my ex-girlfriend forgive me? We been apart for weeks & I'm trying so hard to win her back. ;(?

I have been knowing my girlfriend since our freshman year in high school. When we first meet her we became the best of friends then slowly feelings grew between us. Later i decided to ask her out n she left everything to be with me such as i did too. We were so glad to finally have each other since we had always felt a little spark. We were unbreakable. Then slowly problems grew and we would argue over dumb little things that could be solved easily, but we just never could. Lately Ive been trying to win her back Ive tried many ways to talk to her and give her chances to go back with me and i will give her space. But none of the above she choose, none. I don't know what to do. I'm only !8 years old and it might sound stupid but man im in-love wt this girl. Shes the only girl that i feel happy with. i can be myself around her n she enjoys it. she does love me i know that because times Ive hurt her she has stuck around to be with me. Shes such an amazing girl she really can put a smile in your face at any moment just with a quick glance of her beautiful eyes. Im not going lie i use to be a very bad guy i would hurt girls left to right i wasn't the best guy i sucked at relationships, till i meet her she change me completely. I felt love for the first time i actually had a long relationship that lasted more then a month. I also changed her ways of love and other stuff. We both became wonderful. That's why she means so much to me. I know y'all are going to just tel me to move on but trust me i cant Ive tried and i cant its impossible. I know there might be a chance to not win her back again but damn it im going to give it all i can and i hope there is some one out there that can help me out. This means more den anything to me so please some one help me... thank you,