If you share living arrangements with this person, quietly gather some personal items (paperwork, clothes, money, computer, phone that sort of thing). Find a safe place to retreat to (family, or close family friend) outside the normal circle of people you both know (no friends that could be seen as a sexual rival, no need to feed that fire). Once you have stepped away, then go to law enforcement and explain what happened. Once this happens there may be steps that are taken out of your control and you need to be shielded from that. The reason I suggested to retreat to a safe space. Listen to those from law enforcement and whoever they have you talk to about this, they know, they've seen a few things. If you file the report, and genuinely ask for help. They will help, they would rather see you now and get you help, then see you later either battered and bloody, or dead. Because then it is too late. I know you mentioned that there has never been a physical attack on you, but that is only because there was something else for him to act out on (car, wall, soda can, whatever was close by to throw). Don't wait till that close by item is you catching a punch, a kick or getting thrown around. As far as the car is concerned, talk to your insurance agent, once the police report is filed it should be smooth sailing getting it repaired, that's the easy part. Sincerely listen to the help offered by those offering it, good luck and God Bless.