It is not you, as the others has said, it is his issue, and one that is affecting you and your relationship. Kind of like having another woman on the side isnt it. Produces the same result anyways. I agree, even if you lose weight it will not help the situation. So lose the weight for you not him. Then hopefully you will see what is guy is not and find someone who appreciates you and not some fantasy to get off on. To me that is the biggest insult there is. I would rather my man go find a woman than get into that stuff. Then I would send him and his couch to her to put up with permanently. I simply wouldnt put up with it, but that's me.
I would recommend you do some research. You will find that men that prefer porn over women, usually act just like this guy is.
There is nothing you can do. It will have to be up to him. The question is, how much are you willing to tolerate? Unfortunately, it usually just gets worse for the woman involved, because the more the man becomes involved with porn, the less he will be involved with you. And that is every aspect of life, not just intimacy.
Comngratulations on the weight loss, but I would recommend you do it for yourself, for your health and esteem.
communication is the key to intimacy; get him to pormise you to please you also might help. i think sex is mutual so make him pleasure you :)
He's has a porn addiction problem and is being satisfied by the porn. If you are dieting, because you feel overweight and not attractive enough for him or feel it is the cause of him not wanting you intimately then you are not only being neglected in the bedroom at no fault of yours own, but it's effecting you emotionally also, because he is making you feel unattractive and overweight. Congratulations on losing 10 pounds, that's a wonderful accomplishment but make sure you do it for you and not for him.
It's time to have a disussion with him on your concern that he has become addicted to porn, his lack of interest in intimacy, how it is making you feel, not meeting your needs and how can you both resolve this issue, before it destroys your relationship. Good Luck and keep us informed on how you are coming along.