Why does my sister always try and compete with me for the same guys?

Anonymous
Every time I like a guy and start talking to him, my sister tries to talk to him too behind my back. If she gets him to go out with her, she rubs it in my face and talks about their "intimate" life and how he's so obsessed with her and chose her over me to make me feel bad. How can I get her to stop this annoying behaviour? She's 2 years older than me. I'm 18 and she's 20
Why does my sister always try and compete with me for the same guys?
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