Husband watches porn

My husband is watching porn even after I asked him to stop. We have been married for 3 months but I had an idea when we were dating that he was watching then but couldn't find any evidence on it. Since we have been married he just leaves it on his phone history ( which is goodhe doesn't delete it ) But also he does it when I am home. For example, last night I was in the shower when I came out and he had head phones in, I knew something wasn't right because he never does. When he went to bed I went through his phone and sure enough, he was watching porn. When I brought it up in the past he told me he wouldn't watch it anymore, but look where we are again. It makes me feel betrayed, cheated, not good enough and like I am not even really wanted. I have went so far with it that I have went out of my comfort zone to buy lingerie and try new things in bed that I don't really like but thought would satisfy him. I guess it hasn't.So it makes me feel even worse about myself. I am at a total loss of what to do.