What is the Motivation?

Alfie is four.   He is standing in front of his mother’s full length mirror and sobbing because his mother is not going to let him come with her in the car.  He has to have a babysitter, even though he’s not a baby.  He sees how his face has gotten all scrunched up and red with his sobs.  He watches himself rub one eye at a time with a little fist.  His t-shirt makes a good handkerchief to wipe tears off his cheeks, but the tears still sting.  Look how his lips are quivering.  He tries wailing and then choking.  He likes to watch himself cry. Why is that?