Something happened between these two, but I’m not sure if it’s lovey. Remember those kids whose parents were friends with your parents? Not always the best company. Also – they are both old enough to have been alive during whatever happened with Avatar Aang 40-some years ago. 

It would be a pretty big change in Lin’s character to suggest that she used to be a romantic person and has been turned hard by being slighted. I like to think that she’s just blunt, abrupt and won’t take no sh*t, like her mother.

You can always Ask Lin too. : )