Break Up & Divorce

My ex dumped my after rumors and started to date my former bff. How to know if he is toxic or just misunderstood my intentions?

My ex was my best friend first. He told me that he loves me and that I'm his soulmate and it was really see but then I told him I love him and from that point everything that was good before or non-problematic started to be a problem. We broke up but he convinced me to be friends it didn't end well because he wanted for me to still acted as his girlfriend (only with responsibilities to him) and he didn't acted as friend. But after talk we decide to give another try. He made some mistakes but ones that when I didn't argue about he was later good and helpful. But then my nemesis started a rumors about me that I cheated on party when I was without my boyfriend. All people (my friends or people they barely know me) confirmed that my nemesis lied because time, people, situation and all were wrong. So it couldn't had happened. But my ex didn't even broke up with me he stopped talking to me. When I texted him I discovered that I'm bad person and he don't want to have anything in common with me. My former best friend and also our "group" who were also best friend with my nemesis also stopped talking to me even after I confirmed with them that between us is good. It was in spring and after vacation he started to date my former best friend. They tried to force reaction from me but I didn't do anything even when people laugh that he don't care about her. Now she went back to her family in Ireland and he stayed so they pause/broke up. Between this he stopped realtionship with some of my former friends (especially with one who helped my nemesis to try to destroy me) because he discovered they were toxic gossiping liars (like my nemesis and my former best friend). I can't understand why person I known for years, who saw how I care and help him would had do this to me. I will also add that he had rough childhood, he was bullied, had abusive father and I think he don't trust people at all.

Updates
+1 y
He chose to trust me but I "betrayed" him in his eyes. But I showed him evidence that my Nemesis was lying and he always told me that he don't like girls like my former friends and he is still friends with some of them.
Updates
+1 y
He recently went on our chat on messenger after getting drunk (I think to think about memories we shared). I knew this because he accidentally send a text with emojis which was set on chat and he deleted it and blocked me. ( I think he went on our chat after 3 years on perposue because we didn't used it for years so it was far below and also we don't have ourselves in friends on FB so I couldn't show up to him as online. So there is now way to do it on accident) I think he hoped that would be as
My ex dumped my after rumors and started to date my former bff. How to know if he is toxic or just misunderstood my intentions?
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