Can anyone please help me figure this out?? its driving me crazy! 10pts?

he have his reasons to hide it from you but he shouldnt have brought it up if he didnt have enough courage to tell you what it is. Dont waste your time on making him tell you but use that time to make him trust you. As time flows he will slowly let go and he'll tell you when the time is right. Forcing him is just going to make it harder on him. because he knows what it is but you don't. It worries you but this is something you just have to stick with it for the time being before he tells you what it is. If he can tell you anything but not that, it means he still is not comfortable with you still. not comfortable enough to tell you that one thing that is really bothering him. but let time takes it course and you will find out. if not im pretty sure you have other ways of finding it out. parents, his friends, etc.