My brother says that I am jealous when I say something or asking something about his fiance. What shoukd I do?

My brother says that i am jealous when i say something or asking something about his fiance. For example i saw cakes on the kitchen table and i asked my mam about them. I was told that my brother got them for his fiance. I say to him that i saw the cakes on the table and he said that i was jealous. A few days before thst he bought her loads of sweets and a giant Easter egg. I can't say anything about his fiance without being told that i am jealous. I asked about his wedding and when it would be. He was very touchy about that. If he is working from home and the dinner is late, he says that his fiance would have it ready on the table as soon as he arrives. I do the best i can with getting the dinner done. What can i do about the way he is when say or ask something?

My brother says that I am jealous when I say something or asking something about his fiance. What shoukd I do?
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