Jealous of my husband's brother's wife?

i have never felt this before until now., I don't understand why I am jealous of my husbands brothers wife. She is 10 years younger than me, she isn't pow wow, but its the way she carries herself. She dresses hip, and I feel she has the personality just like my husbands. If he looks at her I get funny, if he talks to her I get funny. I haven't said anything to my husband because I don't want him to know my weakness but I'm thinking of it wasn't her id be like this with other girls too. Its like I feel she's prettier, trendier, nicer, calmer, cleverer, confident, I'm sick of feeling this way...
Jealous of my husband's brother's wife?
Post Opinion