Insecure!

My boyfriend and I have been together for awhile now. We have a pretty amazing sex life, or so I would say. He says he loves everything about my body. I'm 5'9", 190 pounds, size 14 pants. I have huge hips. I hate it. I've lost almost 40 pounds but I'm still not satisfied. Every ex he has had has been 120 at the most. Everyone of them skinny and cute and petite. And then there's me. Am I the only one who worries like this? I guess I just wonder how he could go from dating such skinny girls to dating me?