The “woman keeping our private keys” meme

I think I did something wrong here. <br><br>My girlfriend is my fiancée now and I thought It was a good idea to change my phone’s private key to something she would have to tell me anytime I called my bank. <br><br>When I asked her to do it, she said yes, but then she tried to change my private key to something we would only find out together. I started to laugh it off and said it was totally ok, but she asked me if I was sure and I said yes again. <br><br>Long story short, all of a sudden I couldn’t change my bank’s password, get through security checks, reset my accounts, etc, because she had the new code. <br><br>TL;DR: Got engaged, changed my phone’s private key to something my fiancée knows and now I have to be in constant contact with her. <br><br>I did something wrong here didn’t I? What is the best way to end this strange situation without hurting her feelings?