Am I toxic, is he or are we both?

I don't know what to call him, my boyfriend or ex boyfriend? i am not sure. anyway, we were together for 8 years. he DMed girl complimenting them on how they look. i am not confident in how i am or what i bring to the table so it really affected me when i saw this. i am angry and hurt still. it happened two years ago and i can’t stop thinking weather or not he wanted to be with those girls instead of me. i think about it all the time so when i do talk to him it’s all anger and bitterness. in the beginning i never had an attitude towards him now that’s all i do. i hate him for doing this to me I don't know how to get over it. i asked him why he did it and the only thing he could say is he was young, stupid and he wasn’t sure if we were going to be together. was he ever into me at all or he felt bad? anyway i bring it up all the time. why did you DM those girls? at least twice A DAY! i wanted to get to the bottom of it so i asked him until i got an honest answer. these past two weeks we haven’t spoken at all. he barely texts me or calls me. i tried to do it and he would ignore me and when he did pick up it would just be bitching about him not wanting to talk, being negative or asking him why he DMed those girls. i know i shouldn’t have done it bc look where it got me. he’s gotten to the point where he doesn’t care what happens. last night he was yelling on the phone how he regrets ever meeting me and how he wished he never asked our mutual friend for my number. he’s frustrated and i know there’s no fixing this. in your opinion am i toxic or is he?
Am I toxic, is he or are we both?
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