Anti-social behavior of this sort can be attributed to many things; I wouldn't say that depression is the sole cause and be done with it. I have a friend whose house is perpetually filthy, and I still visit. The non-cleaning isn't the immediate problem. What kinds of thoughts are you having as to why you don't want to invite a friend? Is there a specific aspect of your domicile that you feel uncomfortable with, or is it more than that?