Why does my ex want to date my friends?

My ex is French so I don’t know if it’s a cultural difference but I told him that I personally don’t want him dating my friends and if he did we wouldn’t be friends anymore. He can do as he pleases but it will cross my personal boundary. He understood, but this is the second friend that he has wanted to date. The strange thing is that he randomly brings it up with girls I know that aren’t his type. It’s the weirdest thing for me and it almost feels like he is doing it on purpose. He tried to get me to date his best friend as well. I just told him that we aren’t dating anyone’s friends. That’s our rule. I find it odd that I had to mention to him because he didn’t see it as strange.
Why does my ex want to date my friends?
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