I used to have a boyfriend who sent messages to scold me again and again after breaking up, added my friends and said some insulting words. How should I solve it?

Make it clear to him that this is a very annoying thing after all. If he is weak, you can do the same to him, but we have quality! Scold beautifully, too, until he never dares to talk to you again and overwhelm him with his aura! Well, I believe you! If he is unreasonable, he is even more unreasonable than he is. If he still loves you or is not convinced to dump him, tell him your reasons, make him useless and let him give up! And realize your incompetence and irrationality. But don't go too far, leave a way out, O(∩_∩)O~