When your friend tries to ask her bf a simple question he gets mad

So one of my friends has a boyfriend and she always ask him questions...little questions like where you at? where you go? when will you be back? What you doing? And he always tells her that she sounds dumb and catches an attitude she wants me to help her find out if more than what he's telling her is true and I need your advice what should I do and what do yall think about the situation? Do you think her bf is cheating?