Should I end it?

I'm attempting to end things with my boyfriend because I feel not good enough for him and that he can get better and I contasntly worry about feeling ugly to him even tho he always reassures me. But when I try to end it he's just says I'm being dumb and that he only likes me and likes the way I look, but I can't bring myself to believe that. I can't even leave the house because I feel so ugly.