Totally agree with the comments but would add that I think the line "You see someone through the window who you just learned to miss" is a reference to his wish for his father not to be dead and that in reality you would not want to go back and change things.
Totally agree with the comments but would add that I think the line "You see someone through the window who you just learned to miss" is a reference to his wish for his father not to be dead and that in reality you would not want to go back and change things.