Please help me understand why his feeling changed :( I want him back!!?

I don't know what to say hun. Maybe he isn't ready for commitment yet? I think he does like you but maybe he doesn't want a relationship at the moment. I am not going to say he used you because i don't know him personally to make a balanced judgement on that. If i were you i would just give him space. I know its hard but you must restrain yourself and leave him be. He will contact you when hes ready to talk, and if he doesn't contact you then i think its safe to say a relationship is definitely not what he wants right now. Good luck, i hope it all works out. xx