I agree with the others. This person has put you into a terrible situation. Get him out as fast as you can. What if he somehow draws police attention to your house? If there is crack in your house it could be a really terrible situation for you. Can you be sure that there is no crack hidden in your house? Change those locks quick! You are doing the right thing by putting his things outside while he isn't home. You never know, he could react violently to being kicked out, so have the phone in your hand and the police on speed dial when he arrives to find his things in the yard. Good luck!