Why did she say she wanted to be friends but gets jealous when I date other girls?

Met a girl, and we went on two dates. She told me that she just wanted to be friends, which I was totally ok with. We talk regularly still, however, when I told her about another girl I started seeing, she got really jealous. What’s the deal here?

Why did she say she wanted to be friends but gets jealous when I date other girls?
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