@Chrondoz basically he likes her but interprets their promise to get married when "he's bigger than her" as when he is taller than her, whereas she likes him but interprets the promise as him being older that she was at the time the promise was made.
This conversation reminds me of a while back, some stupid show about people living in like Alaskan wilderness or something was on when I walked past the TV. Saw these two girls, and the screen had some notation on it about how they were a pair of 13 year old and a 20 year old sisters or somewhere in those ball parks. Whatever it was, one was clearly underage, the other not. So based on their appearances I put two and two together, this one must be the younger sister and that one's the older sister...
Nope. The adult looked like a child, and the child looked like an adult, according to the next scenes notation pointing out that the younger looking one was actually the adult. That was one moment I remember pretty vividly where I was just like "Do I need to start asking people for ID out there so I don't go to fuckin' jail?"