It sounds like your boyfriend is an "enabeler" and perhaps his parents are too. You are right, your bf needs to get this "renter" up to date on his rent, and he cannot be his "caregiver" either. If this guy cannot pay rent, then he is free loading and should get kicked out. As long as this "renter" is allowed to free load, and find "enabelers" he will just keep on following the orders of his "addition/alchoholism". Your boyfriend is not helping him, or saving him, he is allowing him to become more toxic to himself and others.

Open Eyes