Ex threatening me w my nudes😭help

Basically I broke up w my ex about a month ago and his has my nudes that I send him from when we were together......

He popped up earlier and sent me my nudes(pics/vids). And I was like huh.. what’s that about?

He was like if u don’t send me more nudes He will send them straight to my parents and all social media w my sc and phone number attached

He also said that he’s already sent some to his mates....

He’s threatening me sm and being horrible and idk what to do I’m only 16 and refuse to tell my parents about this

What can I do?!!??!?! I need help😭