Why is my husband jealous of my sister?

He hates her and said that she's prettier than me and I hate to say it it makes me hate her too. She was scouted be a fashion model and she graduated from college. What is wrong with my husband? My husband compares me to her. He is always worried about if she has a boyfriend or when she's going to get one. Is this normal? He said I shouldn't even talk to her.
Why is my husband jealous of my sister?
Post Opinion