My boyfriend prefers curvier women but I'm petite, why does that happen?

I'm just trying to understand a little better so please don't hurt me Lol.

When I asked my boyfriend about his preference he says he likes petite girls like me but yet he has posters all over his room of big thick women and even a tattoo on his arm of one ( poison ivy tattoo but she's extra thick in that one LOL). It's pretty obvious but I wanted him to be honest, he was down on his luck apparently when he picked me so I just wanted to know if he was actually attracted to me.
Then I asked him months later once again and he confessed that he does like thicker women and that it will be nice if I was thicker.
He says he loves my body but also says he would like it if I was thicker, which makes me kind of confused and a little insecure about myself that I'm not enough. What do you guys think? Am I over exaggerating about this?

My boyfriend prefers curvier women but I'm petite, why does that happen?
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