Because he felt crummy!!
How many people struggle with portion control? I know I do, especially with sweets. When you make a batch of cookies, only cook what you are going to eat at that time & freeze the rest. Get some wax paper & put the cookies on it just like you would a baking pan. Stick them in the freezer for about 30 minutes. Then, remove from the wax paper, put into a freezer bag & put back in the freezer. When you want a cookie (or 2) you can easily remove them from the bag & bake as you normally would. It's amazing how much longer a batch of cookies lasts when I'm not tempted by a whole Tupperware full of baked ones.