First, you don't really have any legal defense--not even if you thought he'd destroy it. A threat to a person's health or life would justify breaking in on someone's home, but not the fact that he has your property. The correct response would be either calling the police for assistance or waiting to see if he does destroy your belongings, then calling the police and/or suing for damages.Since you don't really have any defense, the best you can do is to be very concillatory and humble, offer to pay for all damages, offer to do community service, and even offer to take anger management classes if the authorities deem it appropriate. And avoid getting into *any* other trouble.