Why does he do these things to me? Does he really care, or is there nothing there?

Well, I dated this boy from April of 09 until February of 10 but we continued talking off and on until October 10. At the beginning of November, he got this girlfriend.. And, I mean whatever I understand that some things that I did shouldn't have been done, so no reprimanding is needed. But, one day I made my facebook status aimed towards her, basically calling her less attractive than I. :p but, someone commented it saying "why do all of your statuses seemed geared towards people girlfriends lately?" and she commented it saying "oh don't worry, she's talking about me." and we got into an argument and my ex got involved and from then on he and she BOTH started arguments to upset me, and they were extremely cruel. He'd say things like, "You're the biggest mistake I ever made" and he'd call me names and stuff, and I've had bouts with depression, and I've attempted suicide 3 times, and he would say things like "You don't even know how to kill yourself properly" and well, around the beginning of February 11, this year, I tried again and got sent away for a while. When I came home, my friend told me my ex came running over to her house when he saw on my facebook that people were saying they missed me and to get better, and he asked where I was and if I was okay. so, I texted him saying that I was fine and we started chatting and he said he was sorry for everrrrything that had happened with us and he was still dating that girl from November, and he sent me a song via youtube called "In View" by The Tragically Hip, and the first lyrics are "I love you, you know I do." and we'd always send each other songs to describe how we felt when we were together, and he had me promise not to tell anyone abut us talking, because our parents don't let us talk to each other after everything that happened with us. So, we hung out a few days later, but right before we were going to hang out, his girlfriend broke up with him. Earlier in the week he'd been telling me he had wanted to break up with her because she was just mean and he didn't like her, but he was visibly shaken while we were together. And he didn't really talk much about it, and he didn't want me to leave and I asked him if he honestly truly cared about me or if it was a game and he INSISTED he did and that he didn't care about the other girl because he wanted it to be over anyway. From the Wednesday we hung out until maybe the next Monday, he ignored me COMPLETELY, and got back together with her on the Saturday that he was ignoring me. Now, before he started dating this girl, whenever I texted him or anything, he'd reply quickly, so that is what I was used to with him. Now, we continued talking as basically just friends from that Monday til April. April 1st, it kind of went back to almost normal. April 7th, which would have been our two year anniversary, (and yes we did keep track of dates closely, both of us) he broke up with his girlfriend that very day and texted me telling me he did so, and I immediately burst into sobs :p but, since we really broke up, I've had no clue how he honestly 100% felt about me because it changed daily. So, I'm a very paranoid person, and when he doesn't reply to me, I get really worried and text him a lot more and get clingy when we aren't even together and he gets SO annoyed by it, but he doesn't say anything mean or anything, he just tells me to calm down and that he doesn't hate me. As far as I know, he isn't talking to his ex anymore, and sometimes when we talk it's honestly like nothing bad ever happened and we're so happy and fluid together, but as soon as he stops replying, I freak. What do I do? Does he still love me? Does he care? I can't just move on, it isn't that easy when you have yourself set that this is the person for you. Some of my friends say he might be using me, but he isn't sexual like that and if he were using me, if anything it'd just be to have control over something and have someone love you constantly. But, he denies that every time I ask and he says he honestly cares about me. What do you think, is this all a game or is he confused, or does he really care and love me?