I need relationship advice please.

I don't really know where to start.. First off, I'd like to tell you guys my viewpoint on watching porn and following pages that have half nude images of the opposite sex. I feel that it's cheating mentally because I want to be the only body my SO enjoys looking at. I guess today started off with the porn issue. I asked him if he watched it last night and he said not as much anymore because he has me. However, I brought it to his attention and how I feel about it today. He blew the subject off and went straight to why I commented on a three year old picture of my old guy best friend at the time. He said something along the lines of, "Oh, so you can comment on pictures of you with other guys?" And then I went off and started talking about how he was liking pictures of these women that were wearing nothing in the pictures. He kept denying it even though I saw on my feed that he clearly was liking the pictures. He finally admitted to it later. And that the reason he liked them was because he was trying to zoom like you can on Facebook. Honestly, it just hurt my feelings and lowered my self esteem. I just feel like I'm not all he wants in a woman. Because all these pictures he likes and the porn he watches doesn't add up to me. They're all skinnier with prettier parts and bigger boobs. I asked him if we switched roles, would he be mad. And he said he'd be pissed. Am I wrong for feeling this way? I just feel like I don't reach his standards and in order for him to get full pleasure, he has to get it elsewhere. I kind of feel like this might be a deal breaker for me just because I'm so insecure as it is and this really hurts me.