Most Helpful Guy
He probably thinks you're bluffing about rhe police.
But when you've said it and he just ignores it and still doesn't return your stuff, you should repeat if one more time, enforce that you're serious about it and if he still ignores it, you should really go to the police, explain the situation, show them you chats about it (if they wanna see it as evidence that you're not making this up) and they will know what to do.
Most Helpful Girl
he's a asshole thats why or he likes to dress up. Sue him for your items