Threatening to send text messages before breaking up.

First of all, you should be glad that you broke up with him. Living like this will definitely bring you a lifetime of pain. Second, his behavior is illegal, so you can sue him. Third, and most importantly, you should pay attention to keeping evidence, such as recording, and save all the threats he sent you. Fourth, reflect on why you missed your eyes in the first place, and how to better understand and protect people in the future.