thanks for your advice guys =]
actually, i tried not calling him for a week, and then when i saw him at a gathering, i tried to pretend that i can move on without him. When he saw that i didn't take the initiative to say hi, he came over to say hi...
maybe i'm just thinking too much.. but i hope that's a sign of care... i just wish that we can still remain close friends, but it doesn't help that he doesn't put an effort into building a friendship (like he said he wishes when he broke up with me)...