My boyfriend tells me I’m beautiful, how do I believe him?

I’m a 5′ 10″ and 279lb (32f), so definitely bigger. My boyfriend tells me I’m beautiful and sexy and that he prefers bigger girls all the time. I’m definitely not used to it and have a hard time reconciling what he’s telling me vs. what I know guys normally find sexy. How do I believe him? I guess a better question would be is do guys actually find my body type attractive?