He's seriously just like, "I've found the meaning of life!" ------ I was also so sad, because I remember that episode when 10 said to Rose, that he wished he could meet someone named Alonzo, so he could say "allons-y Alonzo!
This really does break my heart, cause you tend to forget that the Doctor was a dad once. And then you realized that he had a wife and kids, and he destroyed Gallifrey. Doctor Who punctures your heart, people.