Need advice??

Guys, I've just recently caught my boyfriend watching porn again. I didn't catch him on the act of him actually watching it, but I found the websites he goes on and the videos he clicked on. I even seen that he watches live cam girls. I confronted him about it and he just said that he only watches it when I'm on my period or when he's just bored. Honestly, I've never liked it, to me, it just makes me feel like super insecure and gives me this not enough feeling? I just see the girls and I can't help but compare myself? It's always the same big bottomed skinny waisted females who are just beautifully sun kissed.. and just overall very beautiful.. I'm just this tall dorky flat chested/flat bottomed, somewhat tanned gal. Who just isn't the best looking, but decent enough. He said he would try to stop, but I've told him before when I caught him, how it made me feel and he knows how it makes me feel. It's just sad that he continues to do it even knowing how I feel. He's even asked me one time during intercourse if I wanted to watch porn while doing it with him, I just nodded and said I'll try it, but deep down. I just felt like.. "Am I really not that sexy, that he'd want to watch porn as he pounds into me?" When he put it on, I didn't even know how to react, honestly I wasn't even turned on anymore, plus I don't know if he realized but he looked more at the porn video more than me while having sex. Sure, he would look at me but the majority of the time he was looking at that video. I didn't like it one bit, I just felt like I was just a blow up doll or a stupid fleshlight or whatever. I think after a while he realized I wasn't into it and he turned it off, but it still felt off for me. I remember days maybe even a couple months after that he asked me again if I'd like to watch while having intercourse. I believe I said no and he just said that's alright we don't need that.. but looking at what I just saw now, obviously he needs that? I'm just feeling really low right now, is this how some of you gals feel if you catch your SO watching porn?