Do girls get jealous of their friends when it comes to guys?

I like a girl who's in a friend group of 3 girls. I thought I'd ask one of the other girls if the girl I like ever said anything about me. She said that the girl I like had not said anything about me and tried to dissuade me from asking her out. I asked her if the girl I like was seeing someone or liked someone else but she said she wasn't.

However, I noticed later on that the girl I asked for advice from got jealous over another of her friends when she kissed a guy she herself had kissed some time before. I asked her why it mattered, especially if she didn't even like the guy to begin with. Her reply was 'because I'm a girl.'

So, do girls compete against even their closest friends when it comes to guys? And was I wrong to ask her for advice given how she reacted when her friend kissed a guy she didn't even like? Should I trust her judgment?
Do girls get jealous of their friends when it comes to guys?
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