Relationship help

So, recently my boyfriend and I haven’t been having very much sex and when we do he just looks miserable and today I found porn on his phone and he said it was just to “bypass time” but it’s really upsetting me and I explained to him that I don’t feel good enough for him and gave him these reasons and he said I am good enough but I don’t feel better about myself. What do I do? I’m also 10 weeks pregnant with his kid