Is it possible to feel truly clean and at peace without confessing a past addiction that would only cause my partner unnecessary pain?

I have been with my girlfriend for 3 years. Our relationship is currently in its best phase. I strive to be the best boyfriend I can be, and she has been making amazing progress with her therapy. I have no doubts about us.

However, during the worst phases of our relationship (mostly due to her psychological struggles at the time) and my own life, I relapsed into a pornography addiction several times. She absolutely hates pornography; it is a critical dealbreaker for her. This is an old addiction of mine. When we met, I truly wasn't using it, and I was very sincere about not watching or liking it. Unfortunately, I underestimated my capacity to relapse even after a long time. Back then, I swore to myself I would take this to my grave and just focus on being the best man for her.

Lately, I've been carrying a lot of guilt. Sometimes I can ignore it, but other times it haunts me because I have no one to talk to about this. Now, I am recovered. I’ve been clean for a long time and I am fully committed to her, but the question of whether I should tell her still lingers. I know for a fact that telling her would revive MANY of her past psychological issues and shatter her self-esteem.

I don’t want to ruin her progress or her confidence by bringing up a battle I’ve already won on my own. For those who have been through this: Is it possible to reach a point where you feel truly 'clean' and at peace without confessing a past addiction? How can I move past the guilt and understand that the addiction was a struggle, not a reflection of who I am as a partner?"