This situation is no good at all. You are too smart to fall for this. Something is very wrong about your thinking on this and if you can't see it you need help fast. Professional help. Your safety is on the line as is the safety of the people you live with. You need to talk to a professional because if it's not this guy it will be another. I don't mean to sound harsh and I know I do. id rather be harsh than saying nothing. Don't go there either. If he wants to visit and has enough money for a hotel that would be one thing. You are far too smart for this and I hope you listen to the people on this thread encouraging you to protect yourself.