Why do people say narcissist/emotional abusers never change?

Anonymous

So these people are just doomed? Their partners leave them because they're unbearable and abusive. And everyone says they can't change. Why can't they change? If it's mental illness it can be kept on check to some extent right?

What would be real signs of change in them. I left my husband for the 2nd time in 3 months of our marriage and he's begging and apologizing but he makes me suffer so horribly. And I don't feel he's changing. He's only talking about how his suffering in the last few days have madehim realize my worth. I think maybe he misses me so saying all that but if I go back he'll go back to the same shit.

Also people who are narcissistw and emotional abusers do they have any common mental illness that are common in mkst of them?

Why do people say narcissist/emotional abusers never change?
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