Does it seem like there's any chance of us being together again?

When I was 12 I met this boy. He was 15. We met on myspace and started texting and calling each other. We started dating the first day we met. We met four months later. He came from a troubled home and had anger issues and got suspended from school for fights alot and he did drugs. I was on the honor roll and in church choir. I was shy and sweet, he was loud and obnoxious. We were complete opposites. My mom didn't want me dating at such a young but she saw how happy he made me and he practically moved in with us. He stopped doing drugs and I helped him with his homework so his grades improved. I gave him comfort, compassion, and security and he brought out the adventurous side in me and taught me how to really live. When he was 16 and I was almost 13 we had been dating for nine months when we had sex. Sex became a big part of our relationship. After we've been dating for a year and a half, I had a pregnancy scare and we told our parents, his Dad went to the cops and told them we were having sex because he didn't like it. They separated us. He said he would wait for me, but he lied. He was dating other girls, but snuck over to my house sometimes, just to have sex with me, he made it very clear he doesn't want to be with me anymore. Well whenever he does sneak over, I always tell him I love him and miss him. He gets a kind of sad look. He must still care about me right if he still talks to me? Otherwise he wouldn't even risk it. He went back to doing drugs and he even had to be revived because he overdosed. My grades slipped, I've now had sex with 12 different guys, I smoke and drink, and am extremely depressed. He's 18 and I'm 15 now, he's living with his new girlfriend. I was thinking when I'm 16 I could get emancipated and marry him but I don't know. Does it seem like there's any chance of him wanting to be with me? Considering he talks to me all the time and cheats on his girlfriend with me? What should I do?