I can't think of a title; it's all too complicated

(Very long, so sorry) Relationship question: I was in love with a boy, let's call him Michael, since the 9th grade. He was a senior when I first met him. He has one of those personalities that's just super charming, yet equally as insulting. He puts you down, makes you feel like crap, and then, out of nowhere, does something really sweet and makes you feel wonderful. I watched as he went through two girlfriends. The first, call her Sammy was a mutual break up because of long distance stuff. After a couple months, he started a relationship with her close friend, let's call her Ali. Ali told Sammy in the nicest terms possible, thinking it would be okay, and Sammy was fine with it-- at first. Then she started to get increasingly angry and distant. I asked her about it, and she said she was angry about a lot of things, one of them being the fact that Michael didn't ever talk to her about it himself. Michael said he wanted to do it in person, but admitted he made a mistake. Michael finally contacted her about it and Sammy blew up and cursed him out and made him feel awful. Sammy hasn't really talked to them for a year now. I was shocked and sad about all this, since they were all my friends. Over time, my own frustration at this situation grew. But I still Michael, a lot. I never thought this would pose a problem because I was so much younger and I thought whatever clues people would pick up would seem pretty harmless. I guess I was wrong. Ali started getting angry, or jealous I guess, because she went to school so far away while I still got to see Michael though I was still in high school. Michael and I spent a lot of time together, and I got closer to him. But he started pushing me away with a few months, growing noticeably more reserved around me. And Ali would also go strangely sulky and silent during some of our outings. Granted, most of the time she was mad at Michael for doing something stupid, but I always wondered about other times... In another month, Michael started touching Ali a lot more. Michael was never a touchy-feely sort of person, just very private. But he started putting his arm around her, bit awkwardly, and it bothered me. Of course. But just a couple week later I got some shocking news. Michael had been treating me very badly all night, probably the worst he ever has, just me and saying meaner-than-normal things. Then a little later both Ali and Michael told me that they had a mutual break up. They were not upset at me and did not seem at all angry. But I got really silent, I was so stunned. I don't think I talked for the rest of the car ride. And then I just started thinking about how they had destroyed our friendship with Sammy to get together and now they were broken up, and I just got mad. It was stupid, I shouldn't have. But I blew up at Michael two days later, at first going with that reason and then seguing into something totally different. I started yelling at him for never talking to Sammy himself, never talking to me about our broken friendship with Sammy, never talking to me period, never caring, never listening... and you can see where it all went. Straight down to my deepest feelings towards him, just shy of actually reaching the point where I'd tell him I loved him. Thank God it didn't get there. Anyways, we made up later and forgot about it. But I ticked off Ali because I had gone so silent in the car. After a few more weeks she met me to "talk" (Oh God) and she told me she felt like I had been excluding her and didn't like her. This came out of the blue for me, I didn't realize she felt like that. In an an effort to show her I did value her friendship, and out of desperation due to long months of silence, I told her I liked Michael. Yeah, big mistake. She took it fine, but my confession gave a whole new meaning to her concern about being excluded. She started becoming distant on chat and text, and within two months she blew up at me. She told me that I got too close to Michael, and how I had hurt her and made her paranoid and angry. She said she Michael she thought I liked him a long time ago. She wasn't sure if he believed her though. I think he did, but just didn't tell her. She basically said she felt threatened and angry and felt I had wronged her by acting too close to him, which I did, and confess to doing. I shouldn't have done it, I bad for it, but I don't know if I could have helped it. She said she felt our friendship was "surface-level" and that I had better not act like I like him ever again, especially around her, and that if I ever dated him, she would be very angry. I apologized profusely in an effort to calm things down (this was all over chat, btw), and also because I was low after all the jabs at my character. It ended okay, we basically made up, and I told her I never wanted to see Michael again. Which was true. But after a week, I got really angry. At her, at him, and just in general. She started to chat with me online to see if things were good, and of course I lied and said they were, then finally broke and told her I was mad, but more in general than at her. I said that some of her accusations weren't true, that she had over-exaggerated some very minor and meaningless events. (She had picked up a TON of little things that I had said and done with Michael from other sources or little comments and blown them out of proportion). She did admit that she had gotten paranoid, and that if Michael had made her feel secure, none of this probably would have mattered, but she said she still felt justified in some of it. I agreed. Again, we made up. But I'm still mad. I still don't want to see her. I sort of want to see Michael. But the one time I did see him I just felt so... out of place. And angry again because he hadn't even bothered to say "Hi, how are ya" for two weeks. I always thought, and even told him so that time I blew up at him, that if I stopped texting and setting up times to meet with him and some friends that our friendship would be nonexistent. He said that wasn't true, that he was just really bad with communication, and that people called him, not the other way around. Don't get me wrong, Michael can be very kind at times. Especially when I first met him. When I was younger I always felt he favored me, in a way. He was nicer to me than with others, almost gentle. Probably because I was about 5 feet tall and very innocent in nature. But then he got rough, as he tends to do. Now, I just don't know what to do or say. I don't want to see Ali, but I know I should so we can maintain the friendship. Plus her brother goes to my school and we also hang out. Michael also expressed that he wants us to fix whatever was going on between us (he doesn't know anything except that Ali was being a bit distant earlier). I just want to cut them off completely. In my heart, I don't want to do that to Michael, because I really do love him (and I'm not one to say that lightly; I have NEVER liked a guy before him, and I never thought I'd be stupid enough to fall for someone like Michael :/) and I want to see him. But I know nothing will ever happen, and eventually I will have to let go, and my heart will just break all over again. This is painful enough, but maybe it's better I erase him. Out of sight, out of mind. And maybe, over time, out of memory. So now you know the whole story, what do you think I should do? Keep trying to maintain a relationship with both Ali and Michael, or faze them out completely?