Why can't my husband look at me the way he looks at everyone else? Why can't he call me beautiful?

Ever since I had our son/first child and went from a size 4 to size 12 he hasnt looked at me the same. Ive lost weight since then but should it really matter? I had 3 children for you. Cant that be enough? Why cant you look at me the way you look at my skinny friends and coworkers. Why dont you flirt with me the way you flirt with them?