How do you deal with someone who acts remorseful/apologetic in their behavior but is too proud to actually apologize?

I got a relative that is doing this. I told her straight up years ago I wanted a private conversation. She initially agreed but instead changed her mind. Truth is she’s too afraid to have it because she knows I’m right about some major things. Instead she’s acting super nice and accommodating for the last few years hoping I will “come around”.

I know you can’t change the past but you can reconcile it. I just want he to own up that’s she done wrong. And know she’s knows she’s done wrong. But she is the type who was always use to getting her way her entire adult life. She’s never had someone draw the line with her.

It’s been real uncomfortable around her during the holidays. She’s acts nice and the rest of my family looks at me as a selfish a**hole for keeping my boundary up with her. I look like the bad guy and I hate it. I do not enjoy things being this way at all but i am sticking with my decision. I know if I have and sweep everything under the rug she will eventually revert to her old ways because nobody has ever challenged her about them.

How do you deal with someone who acts remorseful/apologetic in their behavior but is too proud to actually apologize?
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