We don't give advice, do we? At least that is what the 12th step and the 5th tradition say. As for the rest, you pretty much answered your questions already. YOu have done what you can, bringing the person to your home seems like a bad idea to you and your roomate and no doubt for good reason, first and foremost you already have mixed feelings about the person. You have already laid it all out brother, the choice is your weather to give in to your co-dependecy or not. No one else can make that choice for you and I am sure as hell not going to even try.