Why would a girl say ‘just friends’ but act like a jealous girlfriend?

​My neighbor and I are just friends
we hangout, chat, and watch movies together. I don't have feelings for her, and she’s literally the one who said we should just be friends!

​But anytime she sees me with another girl, she gets super jealous, confronts me, and tells me to stop making female friends or following other girls. When I ask if she’s jealous, she stays silent lol! 😂😂

​Why won't she just confess her feelings? Women are so confusing!
Why would a girl say ‘just friends’ but act like a jealous girlfriend?
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