Thanks for the advice, however I think we are stuck. The landlord said they couldn't do anything as long as rent was being paid and there were no damages ot the property. And seeing as this guy is very difficult to reason with, we were looking for a legal issue to try to get out of this situation. (We offered to pay his rent if he would leave, but he refused to.)
I have lived with this guy before and there were no problems at all, it has just been for the school year that his behavior has changed, leading us (myself and my 2 roommates) and the advisor at the University that he may be dealing with a mental illness. But once again, they cannot do anything unless there is physical harm being done.
Thanks for responding, however, I think we will end up just biting the bullet and trying to find a way to rent two places.

