I tried to reactivate my account and I was told to change my password but when I tried to change it, it says password change failed.

I meet someone on tagged his name was Richard murphy. he was really nice. he started talking to me on the app called what app. he was saying if I don't send him 100 dollars he was going to put my face on a nude body and post it all over fb and online. he was threatening he is going to ruin my life. being scared I deleted both accounts but keep the texts and sent them to my personal email. I even changed my email and deleted my fb bc I am terrified . I contacted the app what app and no replies. this scammer needs to be stopped please help.