He said im not slim

Im having a very hard time staying focused and strong after what he told me. It has been eating away my happiness for the last two nights. A couple nights ago we were cuddled on the couch at 2 AM having deep conversations. Jumping to the point: he was having a hard time deciding wether he wanted to tell me something or not “i know it will hurt you” he said. But of course at this point i wanted to know. looking into my eyes and with a sincere voice he says, “i truly dont think youre fat” ...it caught me off guard and made me feel kinda weird because i do mention a couple times to him that im insecure of my body fat and i do call myself fat in the mirror. He proceeds and says, “but i do prefer slimmer girls.” It broke me, confused me, made me feel so insecure of myself just as i began to feel comfortable in my own body around him (more revealing clothes, sex without panties, undressing in front of him) Weve been dating for a serious 8 months. He explained to me as i cried in his arms that night that he still thinks that im beautiful and pretty and that he still loves me. But i just dont know how that could be true if he prefers slimmer girls and a flatter tummy than mine. Idk what to do. I an devastated. I feel shitty. I thought he loved my body.