When someone repeats a pattern of behavior over and over, it’s unlikely they are interested in changing.
If that person dodges responsibility for that behavior – finding a way to explain how “this isn’t that” or it’s someone else’s fault, they aren’t going to change that behavior.
Stop believing their repeated lies and believe their actions. Stop working so hard to rationalize how they act. Stop giving the narcissist or abuser in your life the benefit of the doubt. They don’t deserve it.