John had ordered Dean to protect you with his life while he was away. Not that it was necessary at this point, fulfilling his duties as your big brother was basically branded in Dean's head and weighed on his shoulders.

He just began scooping out the rest of the food you had left in the motel room onto the two plates that you'd pulled out earlier, taking care to give you the bigger portion as he always did, always making sure you ate well - even if it meant giving you his own meal in the end.