We knew it was coming. We could see it a mile away. We could see Suguha was falling in love with Kirito as a rebound after coming to terms that her love for her brother was not going to bear fruit as he is in love with Asuna.
And eventually, she would learn Kirito and her brother are the same person… and end with a broken heart.
We knew it was coming… but still, it gets you right there, right in those feels… ;_;