Just guessing but, is it that maybe your "boyfriend" is not handsome/cute, basically, ugly; that's why you're always rejecting the questions or making a joke out of those questions that is asking you about this "boyfriend" of yours lol
I'm going to answer this question very honestly here. Sure, my boyfriend is definitely no Zac Efron or Luke Hemmings. He's not the most good looking boy in the world. But that's not the reason why I'm keeping this relationship so private. My purpose for keeping this relationship more private, is for certain personal issues you probably wouldn't understand if I told you. In fact, I wouldn't mind the whole school or the whole world knowing. However, at this point in time, it is quite important that certain people don't know about us, if not all they're going to do is try and break us apart and I don't want that to happen. That's why I only post photos of the both of us on my personal Instagram and not my main account.