Not "thick" enough ?

Okay, I've been with my boyfriend for quite a while. Almost a year now. My boyfriend has always been so sweet and patient and still is but lately ever since I knew he was attracted to girls with meat on their bones. He's been getting kind of greedy. But first hearing this, I was okay with it, I thought it was wonderful that he had that interest. I even felt a little more secure with my body and stopped worrying about my body figure as much.

For the past couple of weeks it doesn't seem like my body is enough anymore. He keeps on saying how awsome or sexy it would be if I were to be plumper. I've even asked him "you're happy with how I am now, right?" and he just gives me this bland answer like in a 'yeah, whatever' kind of way. Which chips off pieces of my heart a little. He's never been like this.

There's nothing wrong with putting on a little more meat in the right places or being thick. But, I'm not thick, and I wasn't meant to be a thick girl. He's attracted to hips that are like "45 inches with a ridiculously large cartoon booty. The more he keeps telling me, the more my self worth shreds apart. He doesn't like skinny girls. I myself am a petite, slender girl :( I can't help that and he doesn't understand. He even told me he wouldn't find me attractive if I didn't have a large buttocks :'(

How should I handle this? should I draw the line and be more assertive ?
Not "thick" enough ?
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