give it a break-- although I know it's hard

When guys clam up, it's really hard to open them soon after the problem. It works better to leave them alone, and give them chance and space to evaluate how important you're to each other. I know this is so easy to say as I was in similar situation. The more eager you want an answer, the further the guy will withdraw. Try to give yourself some distraction, such as hang out with some friends, or just chat with the sisters here (better in another place rather than the shared home). Give him some impression that you have your own life, and he's not the answer of your happiness. Cheer up, you cannot change it if the guy does not love you anymore -- even if they say that they care for you. Get to know more people, develop more hobbies, read more(self help books), listen to some nice music, or shape up through more excercise... life is better when we are not roped with someone who does not really love you