How do you get over your first love?

My first love was incredibly intense. We worked together for 2 years before we got together, then moved in together after a few months when we did. I was 18 nearly 19 at the time. We spent 2 and a half years together in total. We had a very rough relationship. She had a history of sleeping around and so my parents didn't approve. We went through a lot together. A hell of a lot. But we always managed to battle through and come out stronger. Memories I have with her are some of the best. I was madly, head over heals in love. But somehow I still wasn't happy. I was miserable, jealous, controlling and young. I had never experienced any of these feelings before. I didn't trust her, but I needed her to breathe. I was obsessed with her, and I still am. We have broken up, but I feel like I am begging her to give me another chance. Even though we both weren't happy. And she hurt me so badly towards the end. I still would give anything to have her back and try to make it work. Is it normal to be obsessed with someone who hurt you? Is there any way I can get over her? Will it ever work if we gave it another shot and I got help for my jealousy/control issues? I know it sounds dramatic but we had our whole life planned out and now I'm so lost x