I videotaped our sex session and now I am confused what to do

I am 32M married to a beautiful 29F. We are now married for 2 years and are in relationship for about 7 years. Truth be told, I love my wife more than my life. We both have a great chemistry together and know each other fetishes and Dislikes.
For example: I have navel fetish and my wife hates showing her navel in public. But for me, she frequently wear crop tops and tease a lot with it to arouse me. I also have a gallery full of her photos (which she made me click) showing off her belly. She knows I use this photos of her for masturbation when she is on periods or either if us is on work trip.
Few months before, I secretly had a desire to videotaped ourselves and I did the same during one of our sex session. The problem or the dilemma is, she is unaware of that and I am not able to delete that video because that video is the best item in my masturbation folder. I know she will not get too angry on this if I tell the truth but this will make her lose trust me me (which I practically already did, secretly) how to take this situation.

TL;DR: I secretly recorded an intimate moment with my wife without her knowledge or consent. I know it was a serious breach of her trust, but I’ve struggled to delete the video because I’m very attached to it. I want to tell her the truth and make this right, but I’m worried about damaging the trust we otherwise have in our marriage. How should I handle this?