I 23M hit the woman I love 22F when I was drunk and I have no recollection of it. How do even process this and repair anything?

Pretty much title. Me and her are in our early 20s and this happened a little over a year ago. We got in an argument and I brought up how I feel like she resents me and it all came out what happened and it explains her distance and anger that comes out every so often. I have known very vaguely of the event but tonight she has told me but went explained in detail what happened and I completely mortified. She blames this rightfully as the reason she lost all trust in me. I am not an angry or physical person whatsoever nor have an alcohol problem and could never believe I could be capable of this. I am lost, I feel disgusted. But I truly have no recollection of this or any feelings that would push me to act like that. How could I ever redeem or repent of this. I don’t know how to I could ever regain her trust. Especially this happened some time ago and never once put her in that position since. Any help would be very much appreciated.