If someone was living in your house as a guest, would you just let this person stay and without paying? I might, I might not. (I'm not trying to say I am generious, the thing is, there are certain things that are not under my control.) That's depends on situation. But there must be a time limit. It cannot be going on forever. I mean, there must be a deadline. You can not just let this go on and forget about it. You have to check on that person's situation. Is he going to find a job? Or is he well? Is the room turning into a landfill? You don't want a dead body laying on your property and turn stink, right? Even thougt you are trying to be a Buddhist. You have responsibility to end this matter.