He does not get it...MIND YOUR BUSINESS!?

moved into a new apartment living with strangers. In this apartment, I just want to stick to myself i.e. say hi to the housemates & thats it (but I am nice in the sense that if someone has an emergency I will help, but otherwise I want to just mind myself). But one person in the house does not get it. How can I get him to STOP asking me personal questions, stop probing me and stop acting friendly without being rude?