Received a threatening text message about emotional disputes! What should I do?

The reason is this: my aunt and her boyfriend gave birth to a daughter because they were not registered to get married, and now they are in foster care at Qingyuan grandma's house because of financial problems. At this time, my daughter is two years old. Because both men and women are not registered to get married, the two sides agreed to break up because of emotional problems, and the daughter was raised by the woman. Although I broke up, I feel that my boyfriend is getting more and more psychologically problematic. I made many phone calls, which led to many quarrels and always "killed your whole family!" Such angry words don't feel like his usual style of jokes. However, a few months later, menstruation met another boyfriend, whose behavior became more extreme. She always called my aunt to ask her out to meet, saying that she wanted to have an "emotional end", but she talked many times and soon called to ask for another meeting. Later, my aunt got scared and the phone was turned off. Now it has become several threatening text messages sent to me (. The content is that if menstruation doesn't come out to meet in a few days and make it clear, he will poison their well or break it with his other hand, so that the whole family will die. Because he drank rat poison at his aunt's house some time ago, he found that it was no big deal in time, so now he has sent so many threatening text messages, which is really creepy! I believe this may be true.