And you might want to check your lease. Allowing him to establish residence there, with you as his defacto landlord, rather than adding him to your lease with your landlord, might put you in violation of your own lease, and provide your landlord opportunity for action against YOU.
This times 10 ! Last thing you want to do is take him to court only to have the judge award HIM with an order for actual and punitive damages against YOU for the "self help eviction" and destruction of his property. Happens a LOT, and leaves a lot of people who thought they had a strong case against a "squatter" walking out of the courtroom dazed and OWING money to the very person they were trying to get money FROM.And please don't exercise self-help by getting rid of his stuff. Depending on the jurisdiction, you could face everything from fines to jail time if you do that.

