How can I stop my friend trying to steal men?

I have a friend who (I think) is in competition with me. She’s a good friend in some ways but there’s one thing that annoys me. It seems like every guy I like or am talking to or dating she will go behind my back and try to flirt with him. she is currently dating someone I used to talk to. When I started seeing my current, who she’s never met, she found out who he was, followed him on Instagram and started posting raunchy pics on her story. I confronted her about it and she said she just ‘wants to be friends with who I’m dating.’ But I don’t trust it because she’s done it to me once before. How do I stop her?

How can I stop my friend trying to steal men?
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