A person who is sad will have millions of reasons . In a single why they can't answer you or can explain what they feel . Simple as that . Don't try to squeeze the answers you want from them . If you ever do this there is no point you being alive .
If you are ever asking them why you seem to be dull ? Why are you upset ? There is nobody else who can hurt them more than you .
If they let you know the reason that's great or else don't do a questionnaire session with them .
Leave them alone ! That's all they need
They are normal ! After all we are all humans . Don't find happiness in others tears .
P.S - I don't cry , doctors have doubted whether I have tear glands :))