Is it normal that my ex is trying to be friend with my friends?

My ex boyfriend, whom I broke up with months ago, is now trying to contact my close friends on social media, he wants to message and talk to them. Do you think this is normal? My friends think I'm exaggerating, but I definitely don't want them to talk to my ex boyfriend. Is it normal that my ex is trying to be friend with my friends? How would you react to your friends and ex boyfriend in such case?

Is it normal that my ex is trying to be friend with my friends?
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