I really love my boyfriend but I go through strange on off phases of either…

I really love my boyfriend but I go through strange on off phases of either not feeling good enough for him and hating him because I think I’m intellectually superior and can get a smarter, more attractive boy. Usually I love his extra cushion; it’s better to hug but sometimes I look at him and just think he’s fat and ugly. It’s so odd. I think I’m just a horrible person but I don’t know.