Have you ever had a friend or friends’ that tried getting with your partner behind your back?

I have experienced this and witnessed this a bunch of times and it’s so messed up , but goes to show how selfish people can be and it’ sucks finding out your so called friend isn’t really your friend, by doing this shit behind your back. I have ended friendships and beat up some of them over this. I know attraction is a powerful thing and why it’s wise not to really bring someone you are dating around your so called friends, because unfortunately they can easily try to betray you. I have witnessed and experienced girls’ doing this to each other as well. Have you ever experienced this with friends? And what did you do about it?
Have you ever had a friend or friends’ that tried getting with your partner behind your back?
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