Aquarius acting distant??

Ok so I have read that Aquarius guys tend to sometimes become distant in relationships. Go from completely hot to freezing cold. My Aquarius guy went from being a completely sweet guy one day to acting completely distant and heartless a week later. And now he hasnt called me or messaged me at ALL for a whole week. I dont want to be pushy and call him because Im guessing he needs some space... even though it's killing me. I've never gone longer than 2 days without talking to him and we used to talk for hours on the phone. I was just wondering what should I do?? Should I wait for him to call? Some people told me that I should try acting distant and cold to HIM the next time he calls. U know... the whole treat him like how he is treating u routine. I dont know if I should tell him how Im really feeling because I dont want to drive him away or anything. Also, how long do these disappearing acts normally last? Because I dont think that I can go another week without talkig to him or seeing him.