Why did this woman get jealous when this other woman said hello to me?

This woman lets call her Claudia has said she loves me and misses me over text and she said she thinks I am cute. I have female friends. One of the female friends said hello to me at an event we were both at. Claudia then spoke to me in front of the female friend and said she would block me because my female friend did not say hello to her. The female friend asked Claudia if she was jealous. Claudia did not answer. What is going on with this? Why would she get jealous if another woman speaks to me and not her? Why?

Maybe she likes you
Deep affection for you but might not like you
She wants you all to herself regardless
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Why did this woman get jealous when this other woman said hello to me?
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