I really understand the pain you are going through. My husband had a bad porn addiction while we were dating, this went on for two and a half years. Two months before our wedding, he stumbled and fell back into it. But he managed to stay clean for eight months before then, and now, he's really broken through this addiction. There are times he's tempted, but he no longer looks at porn, at all. He may be over his addiction, but I'm STILL healing from the pain it caused. It creeps in all the time. Even though he's stopped, the mentality "I have to be better, I have to look better..." But, just like he has healed, so will I. And I've already made lots of progress! (We've been married about six months now, just so you know).
People have said a lot of good things here. I don't know your whole situation, I don't know if he is willing to seek help, if he is willing to fight it. I don't know the extent of your relationship outside of this. So I don't know if you should stay or go. If he isn't willing to fix it or change, I'd say get out, You don't deserve that or need it! And if he IS willing, there is so much on-line support!! I recommend accountability software, some you have to pay for, Covenant Eyes is great and what my Husband used to break his addiction ($7.00 a month) but if you want to save a buck, Triple X Church has a free one (but it's not as good).
DON'T look at those pictures again! I know it's tempting, you want to meet her. You want to know her. You want to know why. But it's not real, and it's only going to FILL YOUR HEAD and rattle around in there. It's going to taint your life. Push them aside, and remember. It's not real. Porn isn't real.
IT IS NOT YOUR FAULT. There is nothing wrong with your body, and you could look EXACTLY like those pictures and videos and it still wouldn't be enough. It has nothing to do with you, or the way you look. It has nothing to do with ANYTHING about you. I'd be willing to bet this started long before you, and will continue long after if he doesn't want to beat it. He may not realize it, but it's hurting his life too. Porn addiction does messy things to your brain.
And please, rant away. Don't bottle this up inside, talking about it is good

Just be careful about what people say, don't let anyone make you feel bad about it. I'm not saying that your boyfriend is a bad person for having an addiction but, just because that doesn't make him a bad person, it doesn't make it wrong for you to feel hurt. It's the natural consequences of Porn addiction. I'm not going to call you boyfriend names or tell him to burn at the stake, but he has my pity and sympathy, because no matter what our culture or media or what people say, addiction is unhealthy, and it hurts. It hurts the individual, it hurts the people around them.
Sending prayers and love your way!!!