Have you ever had a jealous person and had no idea why?

My brother's ex-wife is becoming quite a nuisance. I’m not sure why, as I’ve never told her how to live her life. She has turned down every chance to improve herself while my friends, family, and I have all worked hard to achieve our goals. This woman copies my clothing, watches my activities, and speaks to people I know to gather information about me. She follows me on social media and pretends to be in the same career field as us. Everything we do, she mimics, thinking she's doing the right thing. It makes it difficult for me to focus on my job when she acts as if she's part of our profession. While she believes she's doing the right thing, it's actually quite inappropriate. It's unsettling to encounter people like her. My brother is on active duty in the military, and she seems jealous of his career. Since their recent divorce, her behavior has intensified. It feels like she wants to live other people's lives instead of her own. Him being in the military while being married to her was the worst. she swear she knew what he was doing in investigations and learning things that considered opsec. My brother's first ex-wife can't get a break. Every time she receives an award at work, the recent ex-wife receives one as well. Whatever we do is duplicated, and in her mind, she is a part of whatever she believes is going on. I face timed a person that’s mutual to her and now she’s wearing the same shirt

Have you ever had a jealous person and had no idea why?
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