I didn't keep my word and feel guilty. Should I reach out and say I was wrong, or should I just move on?

I was in a extremely toxic 6 month relationship with a crazy ass chick (I know about don't stick your dick in crazy)

She made me promise her I would give her closure if I ever wanted to end things and I gave her my word.

She was being disrespectful often and I was mad so I blindsided her ended things over text.

She repeatedly keep texting me that I promised her I would give her closure, and that that's the only thing she asked me.

She was toxic and disrespectful af so at the time I thought I'm going to put myself first so fuck her closure.

But now it's been 2 months and I don't feel comfortable with knowing I didn't keep my word on something. I feel like one should keep his word no matter what.