I'm with Jim, this whole thing sounds absolutely ridiculous. If I knew I was planning on moving at some point anyway, I'd tell the room mate and the alcoholic, to pound sand. It's likely that since the girlfriend isn't even on the lease, the lease is being violated by her moving in (sorry if this was already mentioned, didn't read all posts). Is this poor decision maker really that important, you are willing to risk and or give up your personal freedoms?