Why does my ex blame me but still talk to me?

Ex and I split up last year, he reached out and started talking. It ended very badly as he use to put me down erc. We’ve been talking for a few months. But he keeps blaming me for anxiety. He keeps saying I give him anxiety and that he’s scared of me because of the way I am? I don’t understand. He’s the one that use to call me b*tch or tell me to f* off or call me an idiot etc. I never did anything like that! Why is he blaming me?
Why does my ex blame me but still talk to me?
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