Why does my GF like my fat(10 points)?

im the same way with my bf.. im skinny and i never dated anyone bigger before and now that i have, i dont wanna go back! he is your size exactly, but taller but 260 lb about. for some reason i love that he is bigger when i used to be grossed out by it but that was when i had never dated a bigger guy. but of course I do try to tell him to maybe exercise or eat healthier for the sake of his health and our longevity as a couple, but if he could be healthy and big i really wouldnt mind.