Advice please?

Okay so I know I probably sound stupid but I really need some opinions and advice from others right now. My fiance and I have been together for almost 7 years. Ive caught him watching porn at least 3 times in our relationship, even though he has always known from the beginning that i am not okay with it. It happened again just a couple months ago. Ive been trying really hard to get over it but it honestly just hurts me. I cant even look at myself in the mirror anymore without almost crying because I feel so ugly. Its to the point where I feel ugly on the outside and on the inside too. I have never been in a relationship where the other person gave me their 100% and I always end up getting hurt. Needless to say i have severe issues with confidence and general anxiety and insecurity. Other than the porn, he is a very good man. He works very hard to support me and our daughter (1 year old) and he spoils the CRAP out of me. Hes even taking me to Disney for my birthday this month because I have never been there and he knows how much i love anything Disney. He really does love me. He truly loves me in the depths of his soul. But then why does he look at porn behind my back? We only have sex like 1 or 2 times in a month and i think its because of the porn. I have told him time and time again that I need more and the porn makes me feel awful about myself. Hes always so sorry but then just does it again a few months later. So what do I do? Do i go ahead with the wedding planning? Do I try to find a job and move on? We love each other so much but the porn and lack of sex is a huge issue for me. It would break both of our hearts if we ended our relationship and it would be an extreme financial struggle for me and i would lose half of my time with my daughter. But I just want to love myself too. I want to feel beautiful and good enough. Ive lost almost 30 pounds trying to be "perfect" for him. I dont know how to change who i am to feel beautiful on the inside. I'm at a loss of what to do.

Id like to stay anonymous so im responding to comments here. Its usually his fault that we dont have sex often. I try all the time. I try different things. Lingerie and everything.