Me 19M masturbated to an ex while being with my current partner 19W. Do i tell her, relieving the guilt but also placing it on her, keep it to myself knowing I’ve fully changed and accepted my past mistakes, or not tell her but also leave as it feels wrong being with her knowing she doesn’t know.

I love my girlfriend dearly, we started talking august 2025, by September we were already talking a lot and not talking to anyone else and throughout since talking I’ve always stressed to her how much i care about only having eyes for your partner etc and told her i did. We met in November 2025 and started dating February 2026. Before we started dating, i had a period of time where i was highly insecure and compared myself to her exs. I also had a porn addiction. During that era, whenever i would please myself to her, these exs would start coming into the picture in my mind and have intercourse with her, one time I couldn’t stand it and decided to go and open saved pictures of a girl i used to talk to while pleasing myself, i then felt really guilty and turned my phone off. I didn’t think of it much since and at the time told myself not to do it again. A few months later, after we started dating, i had misunderstood her and thought she lied about sending material to one of these exes, i was still very insecure at this time and pictured her sending these so went and searched up a girl i used to talk to to see our saved pictures, almost trying to seek power in the situation then quickly deleted the person off my phone fully and felt guilty again. The last few months of our relationships I’ve confessed to a lot of things i did in the past before her that I should’ve told her earlier and these were hard on her but we pushed through and the last one i told her, i knew how much of a toll all of this was taking on her and i promised her that wa the last thing from the past that would pop up. A. Few days later, i found out that in the time before we met but i had already made it clear this was a boundary for us, she saved videos of guys she found attractive to an attractive guys folder. I got upset and said it doesn’t affect us now but it feels like she breached my trust back then, and since ive felt guilty as that was so hypocritical of me knowing i did worse. Since then I been feeling so ashamed about the masturbation thing as that crossed the boundary even more and now i feel like she’s not with the person she thought she was.
TL;DR: crossed a boundary me and my gf had and unsure whether to tell her or deal with the guilt myself