Why won't my boyfriend have sex with me anymore?

I (20) and my bf (30) have been together almost 2 years. He is the first and only guy I've had sex with. In the beginning we had sex everday we were together, 3 or 4 times a week. I also told him from the very beginning that I am not comfortable with porn in a serious relationship. He admitted to watching it a few times but swore he'd stop because he loved me. A few months later I became pregnant and once I gained a few pounds, the sex stopped completely. Soon after I accidentally found a fuck ton of porn on his phone. I brought it up to him and nicely told him that I know about it and would just like him to be honest with me. He of course just lied and denied it all. I was hurt he would lie to me while I'm pregnant with his daughter, but I let it go. I tried to initiate sex every night but he always turned me down, saying he was too tired or sore or sick blah blah blah... then he would go jerk off to porn in the bathroom. It happened every night, valentine's day, my birthday, our anniversary. It made me feel hurt, betrayed, hideous, inadequate... I kept hope that after the baby was born I'd get back into shape and he would be attracted to me again. I lost all the baby weight very quickly and now look better than ever. I was 120 lbs when he and I met and now I'm 102. His porn preference has always been really skinny girls so I thought he'd like me better skinny. It has now been 1 year and 4 months since we have had sex and it has been very difficult on me. I can't get myself off through masturbation either so I've become very sexually frustrated. Other than the lack of sex our relationship is amazing. He's a great father and boyfriend and I do believe he loves me too. But the sex issue is ruining us, it's the only thing we have ever fought about but we fight about it a lot these days. Whenever we fight about it he will blame me. He has said I'm boring in bed, but I've bought toys, lingerie, bondage kits, I let him do me in every hole including my bum, I swallow, I do every position he wants, I ask him to pull my hair, spank/slap me, choke me, etc... yet that's too vanilla for him?!?! He says I don't initiate enough, when I try to initiate every night. I've gotten butt ass naked and crawled up on him and tried to blow him and he just brushed me off again. I've cried and begged for him to just fuck me and he wont. He says I don't do enough to show that I love him, but I do all the work to take care of the baby, I clean the house and his room, I make a big hot dinner and dessert every night, I let him play video games, I give him a full body massage every night, I surprise him with gifts all the time, I buy him things, I constantly tell him he is the hottest man on earth and that I love him soooo much, I put a lot of effort into looking good for him and doing my makeup and losing weight. I'll fast for days and suffer from the pains just to look good for him but nothing seems to work. I know he's not physically cheating, and I know he won't ever stop watching porn for me no matter how much it hurts me, but I don't want to tear our family apart by leaving him. I've told him many times that id accept the porn watching as long as he was honest and still took care of my needs too, but that is too much to ask I guess. I just don't understand why he won't have sex with me anymore, he says he thinks I'm attractive but he doesn't act like it. I have lots of men calling me hot and telling him how lucky he is to have me, and men who want me sexually, but I don't want to cheat on him, I just want him to fuck me again! What more can I do?