what a cheap flock....you are right, he showed his true colors...what are you supposed to do sleep on the floor? he took the food? I hope he chokes on it. He took his daughter's bed pillows? unbelievable.
If you let it go...it will be better for your psyche?...Change the locks first chance you get. (very simple you just need a philips head screw driver, new lock cost $25. at home depot or Lowes).
Karma will come back and bite him at some point. I hope you can replace your stuff with better more comfortable stuff that he can never "taint".