Hello, because of your extramarital lover's character problem, you want to break up with him, and then he used the means to keep pestering, and to threaten you. This matter itself has violated the law, belongs to the violation of your privacy and personal safety, belongs to the offense of the more serious crime.
You can judge how to take the next step according to your own actual situation, mainly to stop this kind of illegal behavior on your infringement. When you can't handle it, we suggest that you can call 110 police, so that the police file an investigation, then the police will find the person concerned, to persuade him to educate him, but also to warn him to discontinue the infringement on you.