how do i get him to be reassured and less insecure?

I have been with my boyfriend for almost a year now. Before we started dating, we talked about our type. i stated mine was the opposite of his physical appearance and honestly his statement was pretty much the same. I didn’t take offense to it, everyone has their own taste and what they look for. Hell i’ve seen his ex and i’m very much nothing like her. But into our relationship he’s brought this up multiple times whether he’s ‘ joking ‘ or not he’ll state he’s not my type. it’s as if he took it personally, but at this point the type thing doesn’t matter. Because he IS my type. i don’t find others attractive. I don’t look for anything in anyone because the man i’m with is the man i’m in love with and i want to spend the rest of my life with. but it feels like everytime he brings this up i feel suffocated and hurt because i can’t take back what i said, and he’s obviously not over it and gets insecure. How do i get him to understand he is the man i am with, he’s the one i’m planning my future with and that a ‘ type ‘ doesn’t matter because he’s my one and only attraction physically and emotionally. He’s so focused on the past and what was said that he doesn’t realize i’ve fallen head over heels in love with who he is as an individual, no matter how many times i remind him how handsome he is to me.