My ex's old text message threatened me that if I didn't pay him back, I would kill my friend and my current boyfriend.

First, don't panic and see if you know the person who sent the text message.

Second, don't delete text messages to save evidence.

Third, let people you trust read this information and ask for help.

Fourth, try not to reply to these messages or have other excessive behaviors.

Fifth, call 1 10 or the local public security bureau to call the police for legal protection.