"I know." What the hell did he mean by "I know."
What did he know?
Did he know how she felt about Pete when she wasn't quite sure she knew?
Did he know how she felt about him?
How she carried a torch for years till it got too heavy, till she burned her fingers too many time and got nothing in return.
What did he know, would he ever tell her?
Did she even want to hear it? Would it complicate her life when she finally thought she knew where she was going?
Did he know about her dreams?