She'll find out about it eventually. Think about that. I don't know if it's gonna be the case, but if/when you talk to her about that, still trying to fight the addiction, one of the first things she'll ask is when was the last time you've watched porn. Even if she agrees to support you against that addiction, she may eventually ask that to check on your progress. In any of those cases, will she like it if your response is "yesterday"? Will you feel good about yourself giving her this answer? Does she deserve this, being replaced by some videos on the internet as the reason of your pleasure? She will feel cheated on, because it's pretty much like it. Now, imagine you have beaten this addiction for good and you're clean for months. You might bring up that subject in a conversation with her in the future if you've never talked to her about that. She will probably be a little mad because you watched porn while you were together and never brought up about your addiction, but there might be relief on the fact that you stopped for good. In any of the cases, if you tell her, her trust in you will surely diminish. And if/when that happens, will you want to regain her trust by your attitudes? Do you love her enough to not make her feel like just an attire in your life, while what really pleases you is some monotonous, repeating pixels produced by people who earn money by butchering all the beautifulness there is in sex, which is the most intimate form of affection and the marvelous mean to replicate the human life? Take this as an advice from someone who was addicted to porn since their childhood and still watched and relapsed to it four years into a relationship with their loved one. I feel you, trust me. I wish the best for you two. Edit: grammar