Ate too much at lunch

Tom asked if I wanted to go to lunch with him and Jeff. I had brought my lunch but decided to get something small and eat with them, taking my salad with me as well. I got a Whopper Jr combo meal. By the time I finished the fries, which I always eat first, I was close to full. Eating the burger had me just past full. I ate a few bites of my cucumber/tomato salad, but of course could not finish it. I decided to eat it later in the day. Already more than full, I just had a Hershey's bar here at my desk, which I didn't need since I was full. I should have just eaten the salad and not buy anything.