Just let him be, monitor him like the others stated. I would wait at least a week to feed him, assuming he sheds within that time frame.
Also I would look at putting a lock on your door. You can get a new door handle from one of the hardware stores for $20-30 and install it. It's very easy to do all you need is a screw driver. That or maybe if you don't feel comfortable doing it, have somebody else do it.
In the mean time I would look for a new place to live, me personally. That shows they don't respect personal boundaries or even your stuff.
