Why are us women so jealous of one another?

Anonymous
I was previously working at a Starbucks before all of this Virus stuff took over. On my last day of work a customer who was with his girlfriend at the time, after placing their order and receiving it, he returned to the counter and asked me for a fork and spoon. I gave it to him. He thanks me but his girlfriend looks at me. Rolls her eyes and as they walk away all I hear is “Why were you all up in her face like that?” And all he did was ask for something simple lol.
Why are us women so jealous of one another?
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