Based on the context and the answer, generate a question. 

Context: I thought Ian was going to lose it when she left . We told him in the morning that she was leaving and he was a fussy , clingy little boy all morning . When she left at lunch time , he clung to me with his little lip quivering getting ready to cry as she said good bye . He just kept blowing her kisses and quivering , I almost cried just watching him .

Answer:

He is a baby , has intense emotions , and ca n't comprehend the reason for events



Why is Ian sad that the woman is leaving ?