Seems obvious to me

So without the whole story, we had a four year realsionship in which we had a lot of arguements. We also both grew up really shitty and therefore each have issues. I have always taken more responsibility for our problems during that four year period, although she did hurt me alot during that time as well which she appears to not understand at all. I can admit that I took her for granted and did a lot to hurt her. I don't know why I was so blind to it but I do see that clearly now.
But within the last three few months, she started seeing someone else after we broken up for the 100th time. I was crushed because it showed this time it was for real. We are talking like can't hardly eat, anxiety through the roof, intense feelings of saddness, and that's just the brief description. She did not talk with me about it and I tried many times through email and conversation and told me that she had absolutely no feelings for me each time I tried to get that from her. In fairness, she never said those words but said "sorry" when I asked her if she did have any feelings for me or similar. Never any indication that she did have feelings for me.
But instead of letting it destroy me, as I often due when my ex breaks up with me, kicks me out, or even with stuff that has nothing to do with her, I decided to improve myself and have been since then. This includes many of the things my ex wanted from me when we were toegther, even though it was too late. But after she told me it was over forever, I met somene too and although it was intially just to have someone because I was so lonely, she turned out to be really supportive and understanding so it progressed a little. Then, my ex started to show interst in us again. However, this interest would go from saying she thinks she "thinks she wants to be with me" to "we can never be." When it was "we can never be" it included her firends and my sister telling her they didn't think we were meant to be after she talked to them. We even slept together and while she chose not to tell the guy she was seeing, I had to tell the girl I was seeing because I felt it was the right thing to do. After all, not telling the girl I was seeing and letting her think that everything was fine and then one day surprising her with telling her that me and my ex were back togther just seemed cruel. That way at least she knew and could make an informed choice. I thought that was the right thing to do but my ex says that I should have never even told her in the first place. But the girl I was seeing was even understanding of that. She didnt ditch me and we kept seeing eachother.
Then in the most resent week, my ex was going back and forth beteween wanting me and not wanting me, four times overall in addition to the ones prior. This included saying that she "thinks" she wants to be with me and that "maybe" she should give us another chance. She even slept in my room a couple of times. Sleeping type sleep was all this time though. I kept the girl I was seeing informed of what was going on throughout the week, again trying to be fair to her. Then, it ended with one night my ex telling me that she just really didn't see us together, followed by later in the night comming into my room and telling me that she again "thinks" that "maybe" we should be together.
The next day I kept the girl I was seeing informed again and she started to ask if I was ever going to realize that my ex is not really going to commit to being toegther again and that I should realize that and let her go. In doing so, she bet me that my ex would go back on what she said again. Intially, I actually got a little upset at the girl I was seeing and defended my ex, but instead of arguing I just took her up on her bet to prove that I did beleive in my ex, despite the evidence. Se I understood that my ex was confused and beleived her when she said she had an epiphany about how her getting angry and always breaking up with me hurt me and us. Then, I did something stupid in telling my ex that I won the bet, thinking somehow that would show her that I stood up for her and beleived she wasn't just screwing with me despite evidence to the contrary.
My ex responded to this with saying she would never come to me again, obviously suggesting she was "breaking up" with me again and forever again. Since then, she has refused to talk to me about the issue again and says I don't understand that I really hurt her and adding that she can't trust me because I talked to the girl I was seeing about us. So as I understand it, she is saying that we really could have been together again if I had not talked to the girl I was seeing. She is also saying that her going back and forth was a "little" thing and that I should not have been upset about that lives. I have tried to tell her that it was not a little thing to me or the girl I was seeing as it impacted our lives.
I'm trying to only state facts so I'll admit I don't know everything she talked to with others, but I do know she talked to her ex about a lot of the wrongs I did when we were together, he told me about them. She used to talk to my family including my sister who lives with us about what I was doing wrong, she has cited to me her friends opinions after she shares her version of our problems with them, and has even posted on facebook that I "would'nt get out" when she wanted to kick me out of our co-owned home once. Note that she acctaully had good reason to that time but the piont is that she posted it to the world. But she says that was not the same as me updating the girl I was seeing beccause it was before we were trying to get back together. I do even feel bad about talking to the girl I was seeing because it hurt my ex, even though it really was what I felt I had to do to keep from really hurting the girl I was seeing. My ex has not apologized for going back and forth, or just ending everything again. And the ending everything when she is mad goes way back to the begining of us and she has NEVER seen how much that hurt me. She says that my issues bring out the worst in her but when I try to tell her how bad her always breaking up with me and responding in anger without a willingness to talk and resolve hurt me and brought out the worst in me, she will not have it.
So my question is do I really deserve to have her not talk to me about what happended recently, leaving me all alone again just as I was when I first found out about her and this new guy. And do I deserve to have her tell me that she will never come to me again about us beccause I talked to the girl I was seeing that inccluded telling her when my ex was suggesting we could be, and when we could not be. Do I really have no right to be hurt by her ending everything with me because of that, just as she did many many times when we were together, and when I have told her so many times how that hurts me and therefore hurts the relationship only to hear that its not that bad and my stuff hurts her but that shouldn't hurt or affect me. The answer seems so obvious to me but I want to make sure I'm not crazy. Somehow, she can really make me beleive that I'm all to blame and that she did nothing wrong. But if it's true I want to know so that I don't keep doing it with her or anyone else.
I was wrong about a lot in the past and even admit to more wrong that her, but she says it's really almost entirely me and this situation seemed to be proof that it is not, especially in the case even if that were true about the past. Am I wrong? I really want the honest truth?