[18M] My 18F girlfriend discovered that I was watching porn. How should I handle this situation?

What should I do? We established boundaries months ago, but I slipped up then and continue to struggle now. We agreed that this behavior constituted cheating, and regardless of the frequency, I broke those boundaries. She feels like I've betrayed her trust, has noticed my wandering eyes, and feels hurt. Despite this, she knows I love and care for her. It's been about two weeks since she discovered what I was doing. When I got caught, I tried to justify my actions and sought sympathy, but I eventually recognized my mistakes, acknowledged that I was wrong, and admitted that I messed up. How can I comfort her? I want her to see that I've changed, but rebuilding trust is challenging since I severely damaged it. I'm not looking for quick fixes; I understand this will take time. I've wanted to stop for over a year, and I've made progress, but she caught me during a difficult moment. I have stopped now and am committed to never repeating my mistakes, except for looking at pictures or videos of her. She's my first serious relationship and my first love. I've grown and improved since we met, and she recognizes that, but overcoming this particular issue has been tougher for me. Having unrestricted internet access as a kid made it even more difficult. I’m not seeking advice on how to stop; rather, I'm looking for guidance on how to move forward and heal our relationship from this point onward.