What should I view this as?

My fiancè has been really on me about eating healthier and gets on me about when I want ice cream or chocolate. We eat salads and all that. I'm not the smallest girl. He keeps saying that if I want to be able to look skinny on our wedding day then I need to eat healthier. It honestly makes me think he is ashamed of my weight. He never said anything about my weight til we got engaged. Idk if it's me taking it the wrong way or if he really hates the way I look. What do you think?