Okay you have to understand something about boys to begin with. Boys don't look at their bodies as much as we do. They do, but they are like whatev. about it. Girls like you said, want to look perfect. Think about when you go out with him, you prob spend an hour putting on makeup, dressing cute for him, but what does he do? Shoves him wallet into his jeans and picks any t-shirt he can find and comes to pick you up probably.
I have a situation similar to you except my boyfriend, loves my curves, loves that I am fat. And we have been dating 3 years. Will me losing a bunch of weight lead to our demise? I don't know but honestly, if it does it just goes to show how much he cared about me for me.
he doesn't know I have beeen working to lose weight, I am avoiding the discussion with him because it's awkward. In the end, I am me and this is my body and I think it's beautiful regardless of how he feels. Yeah I like it if he's attracted to me, but if he is meant for me, he will love me thin or fat.
I think you need to get rid of your mirrors in your bedroom for a night, go out and buy some hot underware and invite him over. He loves your body, he has said so and he doesn't care, he loves you mentally and physically so invite him over and go buck wild.