TIFU My corn addiction got the best of me in my relationship

TIFU because my fiance found cor videos on my phone.
I, a 26 year old male, am engaged to my fiance a 26 year old female. We have been together for almost a year and we have had pur ups and downs but overall i believe we have a wonderful relationship. For context, i have had difficulties with past relationships such as infidelity, lying, manipulation, etc. That does not justify my actions but i believe it helps. Me and my partner have been together for almost a year and we got engaged 4 months ago with us in the process of getting legally married next month and have a wedding on october. When I was single i denied but now see regretfully that i have a corn addiction. I have left it and fell back on it again several times and i tried and though u was over it when me and fiance started dating. Yesterday we went to my moms hous to visit her since she was on vacation and on her own in our town, we have been also moving together to a new apartment ao we decided to take the opportunity to grab some more of our stuff from there to our appartment and while i was packing some stuff she asked me to borrow my phone. I gave it to her and she discovered that i had several deleted videos and well, it blew up in my face when we got home. She understandably got upset and hurt not feelikg enough or me lying about seeing it. She said its not the fact that i watch it, it was more so the fact that i jid it and acted like i didnt need it or didnt watch it. Making her feel that when she thought about it guilty. I truly am sorry about this and i understand my problem but i dont know how to fix it. She is now going to her home town 7 hrs away so she can clear her mind. I dont want her to do that but i do understand that. I really want to fix this but i dont know how. I really dont want to lose her and i fear for our relationship because of my FU
TLDR, my fiance found deleted corn videos on my phone and is understandably upset and i dont know how to fix this mess up. She is leaving town for a couple of days with her mom to clear her mind i hope (what she stated) and i want to fix this.