AIO that my boyfriend has a porn addiction?

I (21F) and my boyfriend of almost two years (22M) have had an extremely healthy relationship. Over Christmas, he asked my dad if he could marry me. The past almost two years I’ve never been happier.

The other day I found out he watches porn. From day one, he knew this was a huge boundary for me. I personally consider it cheating. We talked about it and he was extremely honest with me, we put a porn blocker on his phone, restrictions on his phone (his ideas) he told me I can check his phone whenever I want, and I can tell he genuinely wants to change. He told me it’s an addiction for him and has been for years. He was so scared to tell me because he knew it was such a huge boundary for me. I was heartbroken. I’m very self conscious, and this made it even worse. I think what shocked me is that he hid it for so long from me, even while we’ve been living together for about a year now and I truly had no idea. I told him if I ever see this again, he will never see me again, and I mean it. I have trauma that has to do with pornography from my past and it’s not something I want anything to do with whatsoever.

Anyways. We’ve been talking about it and I’m feeling better because I KNOW he’s working to change and break this addiction. I’ve already seen change. This addiction hasn’t affected our sex lives at all either. It’s really just how I feel about myself. He’s told me it’s not me at all, but my brain still tells me I’m not good enough. My body isn’t good enough. Am I overreacting?